diff --git a/Lib/csv.py b/Lib/csv.py
index 8dfc77e..da3bc44 100644
--- a/Lib/csv.py
+++ b/Lib/csv.py
@@ -264,8 +264,9 @@
 
         # if we see an extra quote between delimiters, we've got a
         # double quoted format
-        dq_regexp = re.compile(r"((%(delim)s)|^)\W*%(quote)s[^%(delim)s\n]*%(quote)s[^%(delim)s\n]*%(quote)s\W*((%(delim)s)|$)" % \
-                               {'delim':delim, 'quote':quotechar}, re.MULTILINE)
+        dq_regexp = re.compile(
+                               r"((%(delim)s)|^)\W*%(quote)s[^%(delim)s\n]*%(quote)s[^%(delim)s\n]*%(quote)s\W*((%(delim)s)|$)" % \
+                               {'delim':re.escape(delim), 'quote':quotechar}, re.MULTILINE)