Issue #20530: Argument Clinic's signature format has been revised again.
The new syntax is highly human readable while still preventing false
positives.  The syntax also extends Python syntax to denote "self" and
positional-only parameters, allowing inspect.Signature objects to be
totally accurate for all supported builtins in Python 3.4.
diff --git a/Modules/_sre.c b/Modules/_sre.c
index 4dcaec1..d4d1d9d 100644
--- a/Modules/_sre.c
+++ b/Modules/_sre.c
@@ -540,7 +540,9 @@
 [clinic start generated code]*/
 
 PyDoc_STRVAR(pattern_match__doc__,
-"sig=($self, pattern, pos=0, endpos=sys.maxsize)\n"
+"match($self, /, pattern, pos=0, endpos=sys.maxsize)\n"
+"--\n"
+"\n"
 "Matches zero or more characters at the beginning of the string.");
 
 #define PATTERN_MATCH_METHODDEF    \
@@ -570,7 +572,7 @@
 
 static PyObject *
 pattern_match_impl(PatternObject *self, PyObject *pattern, Py_ssize_t pos, Py_ssize_t endpos)
-/*[clinic end generated code: output=9f5b785661677848 input=26f9fd31befe46b9]*/
+/*[clinic end generated code: output=1528eafdb8b025ad input=26f9fd31befe46b9]*/
 {
     SRE_STATE state;
     Py_ssize_t status;