Bug #81537 [Com]: Error in regular expression using negation.

Edit report at https://bugs.php.net/bug.php?id=81537&edit=1 ID: 81537 Comment by: ygwgs79hvh at gmail dot com Reported by: jansverre at uffe dot no Summary: Error in regular expression using negation. Status: Verified Type: Bug Package: PCRE related Operating System: Ubuntu Linux 20.04 PHP Version: 8.0.11 Block user comment: N Private report: N New Comment: The problem is that in regular expressions the negation must go inside square brackets. That is not right. Square brackets are used to match a class of characters (even when negated with a ^), which match a single character. <https://www.employeeconnection.one/>github.com Previous Comments: ------------------------------------------------------------------------ [2023-01-11 06:29:22] MadeleineAshton at jourrapide dot com Similarly, the negation variant of the character class is defined as "[^ ]" (with ^ within the square braces), it matches a single character which is not in the specified or set of possible characters. For example the regular expression [^abc] matches a single character except a or, b or, c. <https://www.myhtspace.org/>github.com ------------------------------------------------------------------------ [2022-09-21 08:24:32] antonio at softcodex dot ch Not sure if it's the same issue. I have this regex (see below) that doesn't work on PHP 7.3.33: 7.3.33-6+ubuntu20.04.1+deb.sury.org+1 but WILL work on the windows binary and "php:7.3-apache" docker image PHP 8.1.10: only tested the windows binary preg_match( '/<(\w+)[\s\w\-]+ id="S44_i89ew">/', '<br><div id="S44_i89ew">' , $matches ); expected result: array(2) { [0]=> string(20) "<div id="S44_i89ew">" [1]=> string(3) "di" } actial result: array(0) { } The strangely if you change the + quantifier after [\s\w\-] to * or ? it works. ------------------------------------------------------------------------ [2022-01-04 22:08:02] sebastiaodomingos05 at gmail dot com As I can see, it is rather related to an extra space after adding the letter 'a'. ------------------------------------------------------------------------ [2021-12-01 15:11:36] cmb@php.net This is apparently fixed in PCRE2 10.39 (or maybe earlier), bundled as of PHP 8.1.1. I'm not sure whether we should update PHP-8.0 to this PCRE2 version. ------------------------------------------------------------------------ [2021-10-18 08:43:04] cmb@php.net This is a PCRE JIT issue (<https://3v4l.org/0Em35> vs. <https://3v4l.org/I8BQ4>). ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=81537 -- Edit this bug report at https://bugs.php.net/bug.php?id=81537&edit=1