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Asked: 2026-05-16T23:29:05+00:00

I am writing a PHP script that accepts a regular expression pattern from the

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I am writing a PHP script that accepts a regular expression pattern from the user which is used by preg_match(). How can I check that the pattern is valid?

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1 Answer

  1. Editorial Team

    Just test it.
    preg_match() will return FALSE if the pattern is not valid.

    Return values: preg_match() returns
    the number of times pattern matches.
    That will be either 0 times (no match)
    or 1 time because preg_match() will
    stop searching after the first match.
    preg_match_all() on the contrary will
    continue until it reaches the end of
    subject. preg_match() returns FALSE if
    an error occurred.

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