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Asked: 2026-05-11T01:17:00+00:00

I have the following regex: (?!^[&#]*$)^([A-Za-z0-9-‘.,&@:?!()$#/\\]*)$ So allow A-Z, a-Z, 0-9, and these special

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I have the following regex:

(?!^[&#]*$)^([A-Za-z0-9-'.,&@:?!()$#/\\]*)$

So allow A-Z, a-Z, 0-9, and these special chars '.,&@:?!()$#/\

I want to NOT match if the following set of chars is encountered anywhere in the string in this order:

&#

When I run this regex with just ‘&#’ as input, it does not match my pattern, I get an error, great. When I run the regex with '.,&@:?!()$#/\ABC123 It does match my pattern, no errors.

However when I run it with:

'.,&#@:?!()$#/\ABC123

It does not error either. I’m doing something wrong with the check for the &# sequence.

Can someone tell me what I’ve done wrong, I’m not great with these things.

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1 Answer

  1. Borrowing a technique for matching quoted strings, remove & from your character class, add an alternative for & not followed by #, and allow the string to optionally end with &:

    ^((?:[A-Za-z0-9-'.,@:?!()$#/\\]+|&[^#])*&?)$

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