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-rw-r--r--ext/mbstring/php_mbregex.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/ext/mbstring/php_mbregex.c b/ext/mbstring/php_mbregex.c
index 85219b00e4..cc96e04f39 100644
--- a/ext/mbstring/php_mbregex.c
+++ b/ext/mbstring/php_mbregex.c
@@ -791,7 +791,9 @@ static inline void mb_regex_substitute(
no = onig_name_to_backref_number(regexp, (OnigUChar *)name, (OnigUChar *)name_end, regs);
break;
default:
- p += clen;
+ /* We're not treating \ as an escape character and will interpret something like
+ * \\1 as \ followed by \1, rather than \\ followed by 1. This is because this
+ * function has not supported escaping of backslashes historically. */
smart_str_appendl(pbuf, sp, p - sp);
continue;
}