py3: make sure regexes are bytes

# skip-blame because we are adding just b'' prefixes

Differential Revision: https://phab.mercurial-scm.org/D2475

hgext/convert/cvsps.py

@@ -170,7 +170,7 b' def createlog(ui, directory=None, root="'
         #    /pserver/user/server/path
         # are mapped to different cache file names.
         cachefile = root.split(":") + [directory, "cache"]
-        cachefile = ['-'.join(re.findall(r'\w+', s)) for s in cachefile if s]
+        cachefile = ['-'.join(re.findall(br'\w+', s)) for s in cachefile if s]
         cachefile = os.path.join(cachedir,
                                  '.'.join([s for s in cachefile if s]))
 

hgext/convert/subversion.py

@@ -1129,7 +1129,7 b' class svn_sink(converter_sink, commandli'
             self.wc = os.path.realpath(path)
             self.run0('update')
         else:
-            if not re.search(r'^(file|http|https|svn|svn\+ssh)\://', path):
+            if not re.search(br'^(file|http|https|svn|svn\+ssh)\://', path):
                 path = os.path.realpath(path)
                 if os.path.isdir(os.path.dirname(path)):
                     if not os.path.exists(os.path.join(path, 'db', 'fs-type')):

hgext/lfs/blobstore.py

@@ -27,7 +27,7 b' from mercurial import ('
 from ..largefiles import lfutil
 
 # 64 bytes for SHA256
-_lfsre = re.compile(r'\A[a-f0-9]{64}\Z')
+_lfsre = re.compile(br'\A[a-f0-9]{64}\Z')
 
 class lfsvfs(vfsmod.vfs):
     def join(self, path):