* regexec.c (onig_search): fix problem with optimization of \z.

  [Backport #8210]
  patched by k_tanaka at [ruby-core:54251].


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@40713 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 4 deletions

diff --git a/regexec.c b/regexec.c
index 55c28178c4..33b4a4efa6 100644
--- a/regexec.c
+++ b/regexec.c
@@ -3515,15 +3515,14 @@ onig_search(regex_t* reg, const UChar* str, const UChar* end,
 	  start = min_semi_end - reg->anchor_dmax;
 	  if (start < end)
 	    start = onigenc_get_right_adjust_char_head(reg->enc, str, start, end);
-	  else { /* match with empty at end */
-	    start = onigenc_get_prev_char_head(reg->enc, str, end, end);
-	  }
 	}
 	if ((OnigDistance )(max_semi_end - (range - 1)) < reg->anchor_dmin) {
 	  range = max_semi_end - reg->anchor_dmin + 1;
 	}
 
-	if (start >= range) goto mismatch_no_msa;
+	if (start > range) goto mismatch_no_msa;
+	/* If start == range, match with empty at end.
+	   Backward search is used. */
       }
       else {
 	if ((OnigDistance )(min_semi_end - range) > reg->anchor_dmax) {