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-rw-r--r--generic/regc_lex.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/generic/regc_lex.c b/generic/regc_lex.c
index f57779d..bc61e14 100644
--- a/generic/regc_lex.c
+++ b/generic/regc_lex.c
@@ -875,7 +875,7 @@ lexescape(
* Ugly heuristic (first test is "exactly 1 digit?")
*/
- if (v->now - save == 0 || (int)c <= v->nsubexp) {
+ if (v->now - save == 0 || ((int) c > 0 && (int)c <= v->nsubexp)) {
NOTE(REG_UBACKREF);
RETV(BACKREF, (chr)c);
}