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Editorial Team
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Asked: 2026-05-26T18:45:14+00:00

That is a regex that would match: stringAstring => A stringAAAstring => AAA stringAAAAAstring

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That is a regex that would match:

stringAstring => A
stringAAAstring => AAA
stringAAAAAstring => AAAAA
[... and so on...]

But wouldn’t match:

stringAAstring => null
stringAAAAstring => null
stringAAAAAAstring => null
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1 Answer

  1. Editorial Team

    If the regex flavor you’re using supports look-arounds, this should work:

    (?<!A)(AA)*A(?!A)

    (AA)*A matches an odd number of 'A's and the (?<!A) asserts that it should not be preceded by an 'A' and (?!A) asserts it should not be followed by an 'A'.

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