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Editorial Team
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Asked: 2026-06-17T13:37:08+00:00

Mondays, however, how do I get a regex that will replace all \ that

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Mondays, however, how do I get a regex that will replace all \ that do not have a " after?

I have tried:

$toBeCleaned = preg_replace('/\\(?!")/',"\\\\",$toBeCleaned);

Which of course says:

preg_replace(): Compilation failed: unmatched parentheses at offset 5

Thing is I can get this to work on: http://www.solmetra.com/scripts/regex/index.php just fine.

However I modified it to:

$toBeCleaned = preg_replace('/\\\(?!")/',"\\\\",$toBeCleaned);

Which does not error out but at the same time, of course due to the escaping done, does not work.

I can’t seem to comprehend on a Monday morning why I can’t get it to do its job.

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1 Answer

  1. Editorial Team

    After running @hank’s regex by actually using a word to replace the text I found out my regex was working pefectly fine it just wasn’t replacing correctly. So I changed it to:

    $toBeCleaned = preg_replace('/\\\(?!")/',"\\\\\\",$toBeCleaned);

    Which does actually work.

    I am accepting this answer too because of the problems that can occur from using negated character classes as mentioned on this page: http://www.regular-expressions.info/charclass.html

    I do hate Mondays.

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