PHP regex not working, despite successfully matching in regex101

Question

I'm having the weirdest issue. I've tried referencing other similar answers here, but none seem to fix my issue.

I have the following regex in PHP

It's a messy regex I know, it's supposed to parse code from a module of various versions from different location. It works perfectly in regex101, but preg_match returns false, indicating an error occured. The regex you see is pulled straight from a var_dump. Also pulled from the var_dump is the string being tested. I have included the excerpt that is supposed to match it below.

    if is_set(ArchiveURL) then
        if not is_set(ArchiveDate) then
            ArchiveDate = seterror('archive_missing_date');
        end
        if "no" == DeadURL then
            local arch_text = cfg.messages['archived'];
            if sepc ~= "." then arch_text = arch_text:lower() end
            Archived = sepc .. " " .. substitute( ```

In the full block of text it takes 81,095 steps to match.  
Could it have something to do with that?

Have you heard about our lord and saviour, the regex /x readability flag? — mario
– mario, Commented Nov 8, 2019 at 1:25
@Nick it appears to return PREG_JIT_STACKLIMIT_ERROR. Though I'm not sure how to fix it. — Cyberpower678
– Cyberpower678, Commented Nov 8, 2019 at 1:36
@Cyberpower678 there's a note about disabling JIT on the constants definition page — Nick
– Nick, Commented Nov 8, 2019 at 1:38
@Nick Stackoverflow is a beautiful place. $old = ini_set( 'pcre.jit', false ); did the trick and now it's matching. :D — Cyberpower678
– Cyberpower678, Commented Nov 8, 2019 at 2:47

Cyberpower678 · Accepted Answer · 2019-11-14 19:27:59Z

2

Getting a read from preg_last_error(), it returned 6, which maps to the constant PREG_JIT_STACKLIMIT_ERROR.

PHP 7 uses a JIT compiler for preg_match with a small stack size limit. Disabling it allows preg_match to do its job.

This can be done in the php.ini file, or on the fly in the script by using ini_set( 'pcre.jit', false );

answered Nov 14, 2019 at 19:27

Cyberpower678

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edluis97 Over a year ago

THANK YOU SO MUCH!!! YOU'RE A LIFE SAVER!! ALL HAIL Cyberpower678!!!

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