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Editorial Team
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Asked: 2026-05-16T21:47:28+00:00

Here is the regular expression that I am trying to modify: The client only

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Here is the regular expression that I am trying to modify:

The client only wants the user to be able to enter a maximum of 2 of the same consecutive characters.

^[a-zA-Z0-9-().\&\@\?\""#,\+\''\s\/]{7,}$
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1 Answer

  1. Editorial Team

    You can use a look-ahead assertion:

    /^(?:([a-zA-Z0-9-().&@?"#,+'\s\/])(?!\1\1)){7,}$/

    Here the negated look-ahead assertion (?!\1\1) is tested for each character that is matched by ([a-zA-Z0-9-().&@?"#,+'\s\/]). It looks at the next two following characters and tests if they are the same as the previously matched one. If this is not the case, the negated look-ahead assertion is fulfilled.

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