chore: regens API reference docs (#889)

diff --git a/docs/dyn/firebasehosting_v1beta1.sites.releases.html b/docs/dyn/firebasehosting_v1beta1.sites.releases.html
index fab3e89..4da7933 100644
--- a/docs/dyn/firebasehosting_v1beta1.sites.releases.html
+++ b/docs/dyn/firebasehosting_v1beta1.sites.releases.html
@@ -75,7 +75,7 @@
 <h1><a href="firebasehosting_v1beta1.html">Firebase Hosting API</a> . <a href="firebasehosting_v1beta1.sites.html">sites</a> . <a href="firebasehosting_v1beta1.sites.releases.html">releases</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
-  <code><a href="#create">create(parent, body, versionName=None, x__xgafv=None)</a></code></p>
+  <code><a href="#create">create(parent, body=None, versionName=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Creates a new release which makes the content of the specified version</p>
 <p class="toc_element">
   <code><a href="#list">list(parent, pageToken=None, x__xgafv=None, pageSize=None)</a></code></p>
@@ -85,38 +85,38 @@
 <p class="firstline">Retrieves the next page of results.</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="create">create(parent, body, versionName=None, x__xgafv=None)</code>
+    <code class="details" id="create">create(parent, body=None, versionName=None, x__xgafv=None)</code>
   <pre>Creates a new release which makes the content of the specified version
-actively display on the site.
+actively display on the appropriate URL(s).
 
 Args:
-  parent: string, The site that the release belongs to, in the format:
-<code>sites/<var>site-name</var></code> (required)
-  body: object, The request body. (required)
+  parent: string, Required. The site that the release belongs to, in the format:
+&lt;code&gt;sites/&lt;var&gt;site-name&lt;/var&gt;&lt;/code&gt; (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # A `Release` is a particular
       # [collection of configurations and files](sites.versions)
       # that is set to be public at a particular time.
     "name": "A String", # Output only. The unique identifier for the release, in the format:
-        # <code>sites/<var>site-name</var>/releases/<var>releaseID</var></code>
+        # &lt;code&gt;sites/&lt;var&gt;site-name&lt;/var&gt;/releases/&lt;var&gt;releaseID&lt;/var&gt;&lt;/code&gt;
         # This name is provided in the response body when you call the
         # [`CreateRelease`](sites.releases/create) endpoint.
-    "version": { # A `Version` is the collection of configuration and # Output only.  The configuration and content that was released.
+    "version": { # A `Version` is the collection of configuration and # Output only. The configuration and content that was released.
         # [static files](sites.versions.files) that determine how a site is displayed.
       "status": "A String", # The deploy status of a version.
-          # <br>
-          # <br>For a successful deploy, call the
+          # &lt;br&gt;
+          # &lt;br&gt;For a successful deploy, call the
           # [`CreateVersion`](sites.versions/create) endpoint to make a new version
           # (`CREATED` status),
           # [upload all desired files](sites.versions/populateFiles) to the version,
           # then [update](sites.versions/patch) the version to the `FINALIZED` status.
-          # <br>
-          # <br>Note that if you leave the version in the `CREATED` state for more
-          # than 12&nbsp;hours, the system will automatically mark the version as
+          # &lt;br&gt;
+          # &lt;br&gt;Note that if you leave the version in the `CREATED` state for more
+          # than 12&amp;nbsp;hours, the system will automatically mark the version as
           # `ABANDONED`.
-          # <br>
-          # <br>You can also change the status of a version to `DELETED` by calling the
+          # &lt;br&gt;
+          # &lt;br&gt;You can also change the status of a version to `DELETED` by calling the
           # [`DeleteVersion`](sites.versions/delete) endpoint.
       "deleteUser": { # Contains metadata about the user who performed an action, such as creating # Output only. Identifies the user who `DELETED` the version.
           # a release or finalizing a version.
@@ -125,11 +125,11 @@
         "email": "A String", # The email address of the user when the user performed the action.
       },
       "name": "A String", # The unique identifier for a version, in the format:
-          # <code>sites/<var>site-name</var>/versions/<var>versionID</var></code>
+          # &lt;code&gt;sites/&lt;var&gt;site-name&lt;/var&gt;/versions/&lt;var&gt;versionID&lt;/var&gt;&lt;/code&gt;
           # This name is provided in the response body when you call the
           # [`CreateVersion`](../sites.versions/create) endpoint.
       "versionBytes": "A String", # Output only. The total stored bytesize of the version.
-          # <br>This value is calculated after a version is `FINALIZED`.
+          # &lt;br&gt;This value is calculated after a version is `FINALIZED`.
       "labels": { # The labels used for extra metadata and/or filtering.
         "a_key": "A String",
       },
@@ -147,6 +147,16 @@
             # changed their email address or deleted their account.
         "email": "A String", # The email address of the user when the user performed the action.
       },
+      "preview": { # Version preview configuration. If active and unexpired, # Version preview configuration for the site version. This configuration
+          # specfies whether previewing is enabled for this site version. Version
+          # previews allow you to preview your site at a custom URL before
+          # releasing it as the live version.
+          # this version will be accessible via a custom URL even
+          # if it is not the currently released version.
+        "expireTime": "A String", # Indicates the expiration time for previewing this
+            # version; preview URL requests received after this time will 404.
+        "active": True or False, # If true, preview URLs are enabled for this version.
+      },
       "config": { # The configuration for how incoming requests to a site should be routed and # The configuration for the behavior of the site. This configuration exists
           # in the [`firebase.json`](/docs/cli/#the_firebasejson_file) file.
           # processed before serving content. The patterns are matched and applied
@@ -157,17 +167,19 @@
           { # A [`redirect`](/docs/hosting/full-config#redirects) represents the
               # configuration for returning an HTTP redirect response given a matching
               # request URL path.
-            "glob": "A String", # Required. The user-supplied
-                # [glob pattern](/docs/hosting/full-config#glob_pattern_matching) to match
+            "regex": "A String", # The user-supplied RE2 regular expression to match against the request
+                # URL path.
+            "glob": "A String", # The user-supplied [glob
+                # pattern](/docs/hosting/full-config#glob_pattern_matching) to match
                 # against the request URL path.
             "location": "A String", # Required. The value to put in the HTTP location header of the response.
-                # <br>The location can contain capture group values from the pattern using
+                # &lt;br&gt;The location can contain capture group values from the pattern using
                 # a `:` prefix to identify the segment and an optional `*` to capture the
                 # rest of the URL.
                 # For example:
-                # <code>"glob": "/:capture*",
-                # <br>"statusCode": 301,
-                # <br>"location": "https://example.com/foo/:capture"</code>
+                # &lt;code&gt;"glob": "/:capture*",
+                # &lt;br&gt;"statusCode": 301,
+                # &lt;br&gt;"location": "https://example.com/foo/:capture"&lt;/code&gt;
             "statusCode": 42, # Required. The status HTTP code to return in the response. It must be a
                 # valid 3xx status code.
           },
@@ -179,11 +191,13 @@
             # request URL path matches the glob.
           { # A [`header`](/docs/hosting/full-config#headers) defines custom headers to
               # add to a response should the request URL path match the pattern.
+            "regex": "A String", # The user-supplied RE2 regular expression to match against the request
+                # URL path.
             "headers": { # Required. The additional headers to add to the response.
               "a_key": "A String",
             },
-            "glob": "A String", # Required. The user-supplied
-                # [glob pattern](/docs/hosting/full-config#glob_pattern_matching) to match
+            "glob": "A String", # The user-supplied [glob
+                # pattern](/docs/hosting/full-config#glob_pattern_matching) to match
                 # against the request URL path.
           },
         ],
@@ -193,28 +207,30 @@
               # content rewrite on the version. If the pattern matches, the request will be
               # handled as if it were to the destination path specified in the
               # configuration.
+            "regex": "A String", # The user-supplied RE2 regular expression to match against the request
+                # URL path.
             "function": "A String", # The function to proxy requests to. Must match the exported function
                 # name exactly.
-            "path": "A String", # The URL path to rewrite the request to.
-            "glob": "A String", # Required. The user-supplied
-                # [glob pattern](/docs/hosting/full-config#glob_pattern_matching) to match
-                # against the request URL path.
             "run": { # A configured rewrite that directs requests to a Cloud Run service. If the # The request will be forwarded to Cloud Run.
                 # Cloud Run service does not exist when setting or updating your Firebase
                 # Hosting configuration, then the request fails. Any errors from the Cloud Run
                 # service are passed to the end user (for example, if you delete a service, any
                 # requests directed to that service receive a `404` error).
-              "region": "A String", # Optional. User-provided region where the Cloud Run service is hosted.<br>
+              "region": "A String", # Optional. User-provided region where the Cloud Run service is hosted.&lt;br&gt;
                   # Defaults to `us-central1` if not supplied.
               "serviceId": "A String", # Required. User-defined ID of the Cloud Run service.
             },
             "dynamicLinks": True or False, # The request will be forwarded to Firebase Dynamic Links.
+            "path": "A String", # The URL path to rewrite the request to.
+            "glob": "A String", # The user-supplied [glob
+                # pattern](/docs/hosting/full-config#glob_pattern_matching) to match
+                # against the request URL path.
           },
         ],
       },
       "createTime": "A String", # Output only. The time at which the version was created.
       "fileCount": "A String", # Output only. The total number of files associated with the version.
-          # <br>This value is calculated after a version is `FINALIZED`.
+          # &lt;br&gt;This value is calculated after a version is `FINALIZED`.
     },
     "releaseUser": { # Contains metadata about the user who performed an action, such as creating # Output only. Identifies the user who created the release.
         # a release or finalizing a version.
@@ -223,19 +239,19 @@
       "email": "A String", # The email address of the user when the user performed the action.
     },
     "message": "A String", # The deploy description when the release was created. The value can be up to
-        # 512&nbsp;characters.
+        # 512&amp;nbsp;characters.
     "type": "A String", # Explains the reason for the release.
-        # <br>Specify a value for this field only when creating a `SITE_DISABLE`
+        # &lt;br&gt;Specify a value for this field only when creating a `SITE_DISABLE`
         # type release.
     "releaseTime": "A String", # Output only. The time at which the version is set to be public.
   }
 
   versionName: string, The unique identifier for a version, in the format:
-<code>/sites/<var>site-name</var>/versions/<var>versionID</var></code>
-The <var>site-name</var> in this version identifier must match the
-<var>site-name</var> in the `parent` parameter.
-<br>
-<br>This query parameter must be empty if the `type` field in the
+&lt;code&gt;/sites/&lt;var&gt;site-name&lt;/var&gt;/versions/&lt;var&gt;versionID&lt;/var&gt;&lt;/code&gt;
+The &lt;var&gt;site-name&lt;/var&gt; in this version identifier must match the
+&lt;var&gt;site-name&lt;/var&gt; in the `parent` parameter.
+&lt;br&gt;
+&lt;br&gt;This query parameter must be empty if the `type` field in the
 request body is `SITE_DISABLE`.
   x__xgafv: string, V1 error format.
     Allowed values
@@ -249,24 +265,24 @@
         # [collection of configurations and files](sites.versions)
         # that is set to be public at a particular time.
       "name": "A String", # Output only. The unique identifier for the release, in the format:
-          # <code>sites/<var>site-name</var>/releases/<var>releaseID</var></code>
+          # &lt;code&gt;sites/&lt;var&gt;site-name&lt;/var&gt;/releases/&lt;var&gt;releaseID&lt;/var&gt;&lt;/code&gt;
           # This name is provided in the response body when you call the
           # [`CreateRelease`](sites.releases/create) endpoint.
-      "version": { # A `Version` is the collection of configuration and # Output only.  The configuration and content that was released.
+      "version": { # A `Version` is the collection of configuration and # Output only. The configuration and content that was released.
           # [static files](sites.versions.files) that determine how a site is displayed.
         "status": "A String", # The deploy status of a version.
-            # <br>
-            # <br>For a successful deploy, call the
+            # &lt;br&gt;
+            # &lt;br&gt;For a successful deploy, call the
             # [`CreateVersion`](sites.versions/create) endpoint to make a new version
             # (`CREATED` status),
             # [upload all desired files](sites.versions/populateFiles) to the version,
             # then [update](sites.versions/patch) the version to the `FINALIZED` status.
-            # <br>
-            # <br>Note that if you leave the version in the `CREATED` state for more
-            # than 12&nbsp;hours, the system will automatically mark the version as
+            # &lt;br&gt;
+            # &lt;br&gt;Note that if you leave the version in the `CREATED` state for more
+            # than 12&amp;nbsp;hours, the system will automatically mark the version as
             # `ABANDONED`.
-            # <br>
-            # <br>You can also change the status of a version to `DELETED` by calling the
+            # &lt;br&gt;
+            # &lt;br&gt;You can also change the status of a version to `DELETED` by calling the
             # [`DeleteVersion`](sites.versions/delete) endpoint.
         "deleteUser": { # Contains metadata about the user who performed an action, such as creating # Output only. Identifies the user who `DELETED` the version.
             # a release or finalizing a version.
@@ -275,11 +291,11 @@
           "email": "A String", # The email address of the user when the user performed the action.
         },
         "name": "A String", # The unique identifier for a version, in the format:
-            # <code>sites/<var>site-name</var>/versions/<var>versionID</var></code>
+            # &lt;code&gt;sites/&lt;var&gt;site-name&lt;/var&gt;/versions/&lt;var&gt;versionID&lt;/var&gt;&lt;/code&gt;
             # This name is provided in the response body when you call the
             # [`CreateVersion`](../sites.versions/create) endpoint.
         "versionBytes": "A String", # Output only. The total stored bytesize of the version.
-            # <br>This value is calculated after a version is `FINALIZED`.
+            # &lt;br&gt;This value is calculated after a version is `FINALIZED`.
         "labels": { # The labels used for extra metadata and/or filtering.
           "a_key": "A String",
         },
@@ -297,6 +313,16 @@
               # changed their email address or deleted their account.
           "email": "A String", # The email address of the user when the user performed the action.
         },
+        "preview": { # Version preview configuration. If active and unexpired, # Version preview configuration for the site version. This configuration
+            # specfies whether previewing is enabled for this site version. Version
+            # previews allow you to preview your site at a custom URL before
+            # releasing it as the live version.
+            # this version will be accessible via a custom URL even
+            # if it is not the currently released version.
+          "expireTime": "A String", # Indicates the expiration time for previewing this
+              # version; preview URL requests received after this time will 404.
+          "active": True or False, # If true, preview URLs are enabled for this version.
+        },
         "config": { # The configuration for how incoming requests to a site should be routed and # The configuration for the behavior of the site. This configuration exists
             # in the [`firebase.json`](/docs/cli/#the_firebasejson_file) file.
             # processed before serving content. The patterns are matched and applied
@@ -307,17 +333,19 @@
             { # A [`redirect`](/docs/hosting/full-config#redirects) represents the
                 # configuration for returning an HTTP redirect response given a matching
                 # request URL path.
-              "glob": "A String", # Required. The user-supplied
-                  # [glob pattern](/docs/hosting/full-config#glob_pattern_matching) to match
+              "regex": "A String", # The user-supplied RE2 regular expression to match against the request
+                  # URL path.
+              "glob": "A String", # The user-supplied [glob
+                  # pattern](/docs/hosting/full-config#glob_pattern_matching) to match
                   # against the request URL path.
               "location": "A String", # Required. The value to put in the HTTP location header of the response.
-                  # <br>The location can contain capture group values from the pattern using
+                  # &lt;br&gt;The location can contain capture group values from the pattern using
                   # a `:` prefix to identify the segment and an optional `*` to capture the
                   # rest of the URL.
                   # For example:
-                  # <code>"glob": "/:capture*",
-                  # <br>"statusCode": 301,
-                  # <br>"location": "https://example.com/foo/:capture"</code>
+                  # &lt;code&gt;"glob": "/:capture*",
+                  # &lt;br&gt;"statusCode": 301,
+                  # &lt;br&gt;"location": "https://example.com/foo/:capture"&lt;/code&gt;
               "statusCode": 42, # Required. The status HTTP code to return in the response. It must be a
                   # valid 3xx status code.
             },
@@ -329,11 +357,13 @@
               # request URL path matches the glob.
             { # A [`header`](/docs/hosting/full-config#headers) defines custom headers to
                 # add to a response should the request URL path match the pattern.
+              "regex": "A String", # The user-supplied RE2 regular expression to match against the request
+                  # URL path.
               "headers": { # Required. The additional headers to add to the response.
                 "a_key": "A String",
               },
-              "glob": "A String", # Required. The user-supplied
-                  # [glob pattern](/docs/hosting/full-config#glob_pattern_matching) to match
+              "glob": "A String", # The user-supplied [glob
+                  # pattern](/docs/hosting/full-config#glob_pattern_matching) to match
                   # against the request URL path.
             },
           ],
@@ -343,28 +373,30 @@
                 # content rewrite on the version. If the pattern matches, the request will be
                 # handled as if it were to the destination path specified in the
                 # configuration.
+              "regex": "A String", # The user-supplied RE2 regular expression to match against the request
+                  # URL path.
               "function": "A String", # The function to proxy requests to. Must match the exported function
                   # name exactly.
-              "path": "A String", # The URL path to rewrite the request to.
-              "glob": "A String", # Required. The user-supplied
-                  # [glob pattern](/docs/hosting/full-config#glob_pattern_matching) to match
-                  # against the request URL path.
               "run": { # A configured rewrite that directs requests to a Cloud Run service. If the # The request will be forwarded to Cloud Run.
                   # Cloud Run service does not exist when setting or updating your Firebase
                   # Hosting configuration, then the request fails. Any errors from the Cloud Run
                   # service are passed to the end user (for example, if you delete a service, any
                   # requests directed to that service receive a `404` error).
-                "region": "A String", # Optional. User-provided region where the Cloud Run service is hosted.<br>
+                "region": "A String", # Optional. User-provided region where the Cloud Run service is hosted.&lt;br&gt;
                     # Defaults to `us-central1` if not supplied.
                 "serviceId": "A String", # Required. User-defined ID of the Cloud Run service.
               },
               "dynamicLinks": True or False, # The request will be forwarded to Firebase Dynamic Links.
+              "path": "A String", # The URL path to rewrite the request to.
+              "glob": "A String", # The user-supplied [glob
+                  # pattern](/docs/hosting/full-config#glob_pattern_matching) to match
+                  # against the request URL path.
             },
           ],
         },
         "createTime": "A String", # Output only. The time at which the version was created.
         "fileCount": "A String", # Output only. The total number of files associated with the version.
-            # <br>This value is calculated after a version is `FINALIZED`.
+            # &lt;br&gt;This value is calculated after a version is `FINALIZED`.
       },
       "releaseUser": { # Contains metadata about the user who performed an action, such as creating # Output only. Identifies the user who created the release.
           # a release or finalizing a version.
@@ -373,9 +405,9 @@
         "email": "A String", # The email address of the user when the user performed the action.
       },
       "message": "A String", # The deploy description when the release was created. The value can be up to
-          # 512&nbsp;characters.
+          # 512&amp;nbsp;characters.
       "type": "A String", # Explains the reason for the release.
-          # <br>Specify a value for this field only when creating a `SITE_DISABLE`
+          # &lt;br&gt;Specify a value for this field only when creating a `SITE_DISABLE`
           # type release.
       "releaseTime": "A String", # Output only. The time at which the version is set to be public.
     }</pre>
@@ -387,7 +419,7 @@
 
 Args:
   parent: string, Required. The parent for which to list files, in the format:
-<code>sites/<var>site-name</var></code> (required)
+&lt;code&gt;sites/&lt;var&gt;site-name&lt;/var&gt;&lt;/code&gt; (required)
   pageToken: string, The next_page_token from a previous request, if provided.
   x__xgafv: string, V1 error format.
     Allowed values
@@ -398,7 +430,7 @@
 Returns:
   An object of the form:
 
-    {
+    { # The response when listing Releases.
     "nextPageToken": "A String", # If there are additional releases remaining beyond the ones in this
         # response, then supply this token in the next
         # [`list`](../sites.versions.files/list) call to continue with the next set
@@ -408,24 +440,24 @@
             # [collection of configurations and files](sites.versions)
             # that is set to be public at a particular time.
           "name": "A String", # Output only. The unique identifier for the release, in the format:
-              # <code>sites/<var>site-name</var>/releases/<var>releaseID</var></code>
+              # &lt;code&gt;sites/&lt;var&gt;site-name&lt;/var&gt;/releases/&lt;var&gt;releaseID&lt;/var&gt;&lt;/code&gt;
               # This name is provided in the response body when you call the
               # [`CreateRelease`](sites.releases/create) endpoint.
-          "version": { # A `Version` is the collection of configuration and # Output only.  The configuration and content that was released.
+          "version": { # A `Version` is the collection of configuration and # Output only. The configuration and content that was released.
               # [static files](sites.versions.files) that determine how a site is displayed.
             "status": "A String", # The deploy status of a version.
-                # <br>
-                # <br>For a successful deploy, call the
+                # &lt;br&gt;
+                # &lt;br&gt;For a successful deploy, call the
                 # [`CreateVersion`](sites.versions/create) endpoint to make a new version
                 # (`CREATED` status),
                 # [upload all desired files](sites.versions/populateFiles) to the version,
                 # then [update](sites.versions/patch) the version to the `FINALIZED` status.
-                # <br>
-                # <br>Note that if you leave the version in the `CREATED` state for more
-                # than 12&nbsp;hours, the system will automatically mark the version as
+                # &lt;br&gt;
+                # &lt;br&gt;Note that if you leave the version in the `CREATED` state for more
+                # than 12&amp;nbsp;hours, the system will automatically mark the version as
                 # `ABANDONED`.
-                # <br>
-                # <br>You can also change the status of a version to `DELETED` by calling the
+                # &lt;br&gt;
+                # &lt;br&gt;You can also change the status of a version to `DELETED` by calling the
                 # [`DeleteVersion`](sites.versions/delete) endpoint.
             "deleteUser": { # Contains metadata about the user who performed an action, such as creating # Output only. Identifies the user who `DELETED` the version.
                 # a release or finalizing a version.
@@ -434,11 +466,11 @@
               "email": "A String", # The email address of the user when the user performed the action.
             },
             "name": "A String", # The unique identifier for a version, in the format:
-                # <code>sites/<var>site-name</var>/versions/<var>versionID</var></code>
+                # &lt;code&gt;sites/&lt;var&gt;site-name&lt;/var&gt;/versions/&lt;var&gt;versionID&lt;/var&gt;&lt;/code&gt;
                 # This name is provided in the response body when you call the
                 # [`CreateVersion`](../sites.versions/create) endpoint.
             "versionBytes": "A String", # Output only. The total stored bytesize of the version.
-                # <br>This value is calculated after a version is `FINALIZED`.
+                # &lt;br&gt;This value is calculated after a version is `FINALIZED`.
             "labels": { # The labels used for extra metadata and/or filtering.
               "a_key": "A String",
             },
@@ -456,6 +488,16 @@
                   # changed their email address or deleted their account.
               "email": "A String", # The email address of the user when the user performed the action.
             },
+            "preview": { # Version preview configuration. If active and unexpired, # Version preview configuration for the site version. This configuration
+                # specfies whether previewing is enabled for this site version. Version
+                # previews allow you to preview your site at a custom URL before
+                # releasing it as the live version.
+                # this version will be accessible via a custom URL even
+                # if it is not the currently released version.
+              "expireTime": "A String", # Indicates the expiration time for previewing this
+                  # version; preview URL requests received after this time will 404.
+              "active": True or False, # If true, preview URLs are enabled for this version.
+            },
             "config": { # The configuration for how incoming requests to a site should be routed and # The configuration for the behavior of the site. This configuration exists
                 # in the [`firebase.json`](/docs/cli/#the_firebasejson_file) file.
                 # processed before serving content. The patterns are matched and applied
@@ -466,17 +508,19 @@
                 { # A [`redirect`](/docs/hosting/full-config#redirects) represents the
                     # configuration for returning an HTTP redirect response given a matching
                     # request URL path.
-                  "glob": "A String", # Required. The user-supplied
-                      # [glob pattern](/docs/hosting/full-config#glob_pattern_matching) to match
+                  "regex": "A String", # The user-supplied RE2 regular expression to match against the request
+                      # URL path.
+                  "glob": "A String", # The user-supplied [glob
+                      # pattern](/docs/hosting/full-config#glob_pattern_matching) to match
                       # against the request URL path.
                   "location": "A String", # Required. The value to put in the HTTP location header of the response.
-                      # <br>The location can contain capture group values from the pattern using
+                      # &lt;br&gt;The location can contain capture group values from the pattern using
                       # a `:` prefix to identify the segment and an optional `*` to capture the
                       # rest of the URL.
                       # For example:
-                      # <code>"glob": "/:capture*",
-                      # <br>"statusCode": 301,
-                      # <br>"location": "https://example.com/foo/:capture"</code>
+                      # &lt;code&gt;"glob": "/:capture*",
+                      # &lt;br&gt;"statusCode": 301,
+                      # &lt;br&gt;"location": "https://example.com/foo/:capture"&lt;/code&gt;
                   "statusCode": 42, # Required. The status HTTP code to return in the response. It must be a
                       # valid 3xx status code.
                 },
@@ -488,11 +532,13 @@
                   # request URL path matches the glob.
                 { # A [`header`](/docs/hosting/full-config#headers) defines custom headers to
                     # add to a response should the request URL path match the pattern.
+                  "regex": "A String", # The user-supplied RE2 regular expression to match against the request
+                      # URL path.
                   "headers": { # Required. The additional headers to add to the response.
                     "a_key": "A String",
                   },
-                  "glob": "A String", # Required. The user-supplied
-                      # [glob pattern](/docs/hosting/full-config#glob_pattern_matching) to match
+                  "glob": "A String", # The user-supplied [glob
+                      # pattern](/docs/hosting/full-config#glob_pattern_matching) to match
                       # against the request URL path.
                 },
               ],
@@ -502,28 +548,30 @@
                     # content rewrite on the version. If the pattern matches, the request will be
                     # handled as if it were to the destination path specified in the
                     # configuration.
+                  "regex": "A String", # The user-supplied RE2 regular expression to match against the request
+                      # URL path.
                   "function": "A String", # The function to proxy requests to. Must match the exported function
                       # name exactly.
-                  "path": "A String", # The URL path to rewrite the request to.
-                  "glob": "A String", # Required. The user-supplied
-                      # [glob pattern](/docs/hosting/full-config#glob_pattern_matching) to match
-                      # against the request URL path.
                   "run": { # A configured rewrite that directs requests to a Cloud Run service. If the # The request will be forwarded to Cloud Run.
                       # Cloud Run service does not exist when setting or updating your Firebase
                       # Hosting configuration, then the request fails. Any errors from the Cloud Run
                       # service are passed to the end user (for example, if you delete a service, any
                       # requests directed to that service receive a `404` error).
-                    "region": "A String", # Optional. User-provided region where the Cloud Run service is hosted.<br>
+                    "region": "A String", # Optional. User-provided region where the Cloud Run service is hosted.&lt;br&gt;
                         # Defaults to `us-central1` if not supplied.
                     "serviceId": "A String", # Required. User-defined ID of the Cloud Run service.
                   },
                   "dynamicLinks": True or False, # The request will be forwarded to Firebase Dynamic Links.
+                  "path": "A String", # The URL path to rewrite the request to.
+                  "glob": "A String", # The user-supplied [glob
+                      # pattern](/docs/hosting/full-config#glob_pattern_matching) to match
+                      # against the request URL path.
                 },
               ],
             },
             "createTime": "A String", # Output only. The time at which the version was created.
             "fileCount": "A String", # Output only. The total number of files associated with the version.
-                # <br>This value is calculated after a version is `FINALIZED`.
+                # &lt;br&gt;This value is calculated after a version is `FINALIZED`.
           },
           "releaseUser": { # Contains metadata about the user who performed an action, such as creating # Output only. Identifies the user who created the release.
               # a release or finalizing a version.
@@ -532,9 +580,9 @@
             "email": "A String", # The email address of the user when the user performed the action.
           },
           "message": "A String", # The deploy description when the release was created. The value can be up to
-              # 512&nbsp;characters.
+              # 512&amp;nbsp;characters.
           "type": "A String", # Explains the reason for the release.
-              # <br>Specify a value for this field only when creating a `SITE_DISABLE`
+              # &lt;br&gt;Specify a value for this field only when creating a `SITE_DISABLE`
               # type release.
           "releaseTime": "A String", # Output only. The time at which the version is set to be public.
         },