100|[1-9][0-9]|[0-9]. If you want to allow 00 as well, it's easier: 100|[0-9]{1,2}.

Update: of course this needs to be anchored somehow, otherwise it will match substrings of larger numbers.

In reply to Re: Matching string containing values between 0 and 100 inclusive by moritz
in thread Matching string containing values between 0 and 100 inclusive by Anonymous Monk

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