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Asked: 2026-05-23T04:10:32+00:00

I need to come up with a regular expression that validates a string with

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I need to come up with a regular expression that validates a string with the following requirements:

  1. Only contains alphanumeric and the following special characters: !@#$%^&*
  2. Contains at least 1 of the special characters in the list above
  3. The required special character can appear anywhere in the string (for example: !abc, a!bc, abc!)

I keep getting close, but fail on one of the conditions.

Thanks!

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1 Answer

  1. Editorial Team

    The regular expression you’re looking for is:

    /^(?=.*[!@#$%^&*])[A-Za-z0-9!@#$%^&*]+$/

    which will guarantee the string contains one of your special characters using (?=) positive lookahead.

    –EDIT–

    It appears Bohemian decided to completely ignore the comment section of my answer and edited the above example to remove its “unnecessary” character escaping. I really wish he hadn’t because I believe my justification is correct, but there you have it. My original example was:

    /^(?=.*[\!\@\#\$\%\^\&\*])[A-Za-z0-9\!\@\#\$\%\^\&\*]+$/
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