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

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

--- a/hgext/convert/cvs.py	Sat Dec 28 01:12:19 2019 -0500
+++ b/hgext/convert/cvs.py	Sat Dec 28 01:35:05 2019 -0500
@@ -144,9 +144,7 @@
 
         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()

--- a/mercurial/hgweb/wsgiheaders.py	Sat Dec 28 01:12:19 2019 -0500
+++ b/mercurial/hgweb/wsgiheaders.py	Sat Dec 28 01:35:05 2019 -0500
@@ -13,7 +13,7 @@
 
 import re
 
-tspecials = re.compile(br'[ \(\)<>@,;:\\"/\[\]\?=]')
+tspecials = re.compile(br'[ ()<>@,;:\\"/\[\]?=]')
 
 
 def _formatparam(param, value=None, quote=1):

--- a/mercurial/ui.py	Sat Dec 28 01:12:19 2019 -0500
+++ b/mercurial/ui.py	Sat Dec 28 01:35:05 2019 -0500
@@ -1626,7 +1626,7 @@
         # 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'$$')]
 

--- a/mercurial/util.py	Sat Dec 28 01:12:19 2019 -0500
+++ b/mercurial/util.py	Sat Dec 28 01:35:05 2019 -0500
@@ -1165,7 +1165,7 @@
     """
     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):

--- a/tests/run-tests.py	Sat Dec 28 01:12:19 2019 -0500
+++ b/tests/run-tests.py	Sat Dec 28 01:35:05 2019 -0500
@@ -3179,9 +3179,7 @@
                 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 = []