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Asked: 2026-05-26T09:03:53+00:00

preg_replace and preg_match are ignoring \h (horizontal whitespace) and \v (vertical whitespace) flags, and

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preg_replace and preg_match are ignoring \h (horizontal whitespace) and \v (vertical whitespace) flags, and I can’t figure out why.

$text = preg_replace('/[\h]+/', ' ', $text);

That line should replace any string of consecutive horizontal whitespace characters with a single space. Instead, it is replacing the letter ‘h’.

I have PCRE 6.6 installed. I’m aware of [:blank:] as a replacement for \h but I can’t find any alternative for \v (and of course I’d prefer to just figure out why these are not working instead of replacing them with something else)

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1 Answer

  1. Editorial Team

    It’s not supported in your version of PCRE.

    http://www.pcre.org/changelog.txt

    The changelog says \h has been added in version 7.2

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