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Asked: 2026-05-28T05:48:23+00:00

I’d like to have a regular expression in PHP like /A.B./i but the random

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I’d like to have a regular expression in PHP like "/A.B./i" but the random character following A and the random character following B should be equal.

How can I solve this?

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1 Answer

  1. Editorial Team

    This should work:

    $regex = '/A(.)B\1/i';

    The \1 referencing the captured group (.) is called a back-reference (as @Ilmari Karonen was kind enough to remind).

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