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-rw-r--r--ext/misc/regexp.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/misc/regexp.c b/ext/misc/regexp.c
index 5da80dd92..743c262e0 100644
--- a/ext/misc/regexp.c
+++ b/ext/misc/regexp.c
@@ -619,7 +619,7 @@ static const char *re_subcompile_string(ReCompiled *p){
if( rePeek(p)==']' ){ p->sIn.i++; break; }
}
if( c==0 ) return "unclosed '['";
- p->aArg[iFirst] = p->nState - iFirst;
+ if( p->nState>iFirst ) p->aArg[iFirst] = p->nState - iFirst;
break;
}
case '\\': {