cleanup: drop redundant character escapes from `[]` character sets

Flagged by PyCharm.  Most special characters lose their special meaning inside
square brackets.  The `-` in util.py doesn't need to be escaped because it is
the last character in the set.

Differential Revision: https://phab.mercurial-scm.org/D7766

hgext/convert/cvs.py

@@ -144,9 +144,7 b' class convert_cvs(converter_source):'
 
         if root.startswith(b":pserver:"):
             root = root[9:]
-            m = re.match(
-                r'(?:(.*?)(?::(.*?))?@)?([^:\/]*)(?::(\d*))?(.*)', root
-            )
+            m = re.match(r'(?:(.*?)(?::(.*?))?@)?([^:/]*)(?::(\d*))?(.*)', root)
             if m:
                 conntype = b"pserver"
                 user, passw, serv, port, root = m.groups()

mercurial/hgweb/wsgiheaders.py

@@ -13,7 +13,7 b' from __future__ import absolute_import, '
 
 import re
 
-tspecials = re.compile(br'[ \(\)<>@,;:\\"/\[\]\?=]')
+tspecials = re.compile(br'[ ()<>@,;:\\"/\[\]?=]')
 
 
 def _formatparam(param, value=None, quote=1):

mercurial/ui.py

@@ -1626,7 +1626,7 b' class ui(object):'
         # prompt to start parsing. Sadly, we also can't rely on
         # choices containing spaces, ASCII, or basically anything
         # except an ampersand followed by a character.
-        m = re.match(br'(?s)(.+?)\$\$([^\$]*&[^ \$].*)', prompt)
+        m = re.match(br'(?s)(.+?)\$\$([^$]*&[^ $].*)', prompt)
         msg = m.group(1)
         choices = [p.strip(b' ') for p in m.group(2).split(b'$$')]
 

mercurial/util.py

@@ -1165,7 +1165,7 b' def versiontuple(v=None, n=4):'
     """
     if not v:
         v = version()
-    m = remod.match(br'(\d+(?:\.\d+){,2})[\+-]?(.*)', v)
+    m = remod.match(br'(\d+(?:\.\d+){,2})[+-]?(.*)', v)
     if not m:
         vparts, extra = b'', v
     elif m.group(2):

tests/run-tests.py

@@ -3179,9 +3179,7 b' class TestRunner(object):'
                 expanded_args.append(arg)
         args = expanded_args
 
-        testcasepattern = re.compile(
-            br'([\w-]+\.t|py)(?:#([a-zA-Z0-9_\-\.#]+))'
-        )
+        testcasepattern = re.compile(br'([\w-]+\.t|py)(?:#([a-zA-Z0-9_\-.#]+))')
         tests = []
         for t in args:
             case = []