--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -477,6 +477,15 @@ def _matcher(canonroot, cwd, names, inc,
try:
pat = '(?:%s)' % '|'.join([regex(k, p, tail) for (k, p) in pats])
return re.compile(pat).match
+ except OverflowError:
+ # We're using a Python with a tiny regex engine and we
+ # made it explode, so we'll divide the pattern list in two
+ # until it works
+ l = len(pats)
+ if l < 2:
+ raise
+ a, b = matchfn(pats[:l/2], tail), matchfn(pats[l/2:], tail)
+ return lambda s: a(s) or b(s)
except re.error:
for k, p in pats:
try: