Seems need to avoid following by zero-width.
diff -r aeafe78fc869 src/regexp_nfa.c
--- a/src/regexp_nfa.c Fri Aug 22 13:13:28 2014 +0200
+++ b/src/regexp_nfa.c Wed Aug 27 15:35:21 2014 +0900
@@ -4408,8 +4408,10 @@
case NFA_SPLIT:
/* order matters here */
- subs = addstate(l, state->out, subs, pim, off);
- subs = addstate(l, state->out1, subs, pim, off);
+ if (state->out->c != NFA_ZSTART && state->out->c != NFA_ZEND) {
+ subs = addstate(l, state->out, subs, pim, off);
+ subs = addstate(l, state->out1, subs, pim, off);
+ }
break;
case NFA_EMPTY:
--
--
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