regexillegal-characters

Replace chars if not match

I'm looking for a regular expression that removes illegal characters. But I don't know what the characters will be.

For example:

In a process, I want my string to match ([a-zA-Z0-9/-]*). So I would like to replace all characters that don't match the regexp above.

Solution

  • That would be:

    [^a-zA-Z0-9/-]+

    [^ ] at the start of a character class negates it - it matches characters not in the class.

    See also: Character Classes