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Home/ Questions/Q 572853
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T13:39:44+00:00 2026-05-13T13:39:44+00:00

I have situation where in the regular expression is something like this: ^b?A+b?$ So

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I have situation where in the regular expression is something like this:
^b?A+b?$

So b may match at the start of the string 0 or 1 times, and A must match one or more times. Again b may match at the end of the string 0 or 1 times.

Now I want to modify this regular expression in such way that it may match b either at the start or at the end of the string, but not both.

How do I do this?

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  1. Editorial Team
    Editorial Team
    2026-05-13T13:39:44+00:00Added an answer on May 13, 2026 at 1:39 pm

    Theres a nice “or” operator in regexps you can use.

    ^(b?A+|A+b?)$
    
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