CODEWITHSUNDEEP
regexcoldfusion
Mohamad
Mohamad

Reputation: 35349

How can I write a RegEx that only allows certain characters?

I'm writing a small script (similar to SO's tag RegEx) that only allows the following characters: [a-z 0-9 + # - .] But I can't figure out the right syntax:

I've come up with this:

ReReplace(myString, "[A-Z]", "", "ALL") which removes capital letters. I'm not sure how to include the special characters in the expression, however.

The ReReplace() I'm using is a ColdFusion function.

Upvotes: 1

Views: 3122

Answers (1)

Jonathon Bolster
Jonathon Bolster

Reputation: 15961

[^a-z0-9+#\-.] should work. The ^ symbol within the [] means "Everything that's not in this list".

I'm not 100% on ColdFusion and if you'll need to escape the # but if you find any issues, just escape the other special characters.

Upvotes: 7

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