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do not treat \0 as a backref in BRE

The valid BRE backref tokens are \1 .. \9, and 0 is not a special
character either so \0 is undefined by the standard.

Such undefined escaped characters are treated as literal characters
currently, following existing practice, so \0 is the same as 0.
Szabolcs Nagy il y a 10 ans
Parent
commit
32dee9b9b1
1 fichiers modifiés avec 1 ajouts et 1 suppressions
  1. 1 1
      src/regex/regcomp.c

+ 1 - 1
src/regex/regcomp.c

@@ -839,7 +839,7 @@ static reg_errcode_t parse_atom(tre_parse_ctx_t *ctx, const char *s)
 			s--;
 			break;
 		default:
-			if (!ere && isdigit(*s)) {
+			if (!ere && (unsigned)*s-'1' < 9) {
 				/* back reference */
 				int val = *s - '0';
 				node = tre_ast_new_literal(ctx->mem, BACKREF, val, ctx->position);