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Asked: 2026-05-24T21:06:55+00:00

I need a regular expression in python which matches exactly 3 capital letters followed

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I need a regular expression in python which matches exactly 3 capital letters followed by a small letter followed by exactly 3 capital letters.
For example, it should match ASDfGHJ and not ASDFgHJK.

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1 Answer

  1. Editorial Team
    r'\b[A-Z]{3}[a-z][A-Z]{3}\b'

    This will match what you posted if it is a complete word.

    r'(?<![^A-Z])[A-Z]{3}[a-z][A-Z]{3}(?![A-Z])'

    This will match what you posted so long as it’s not preceded or followed by another capital letter.

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