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Regex to see if invalid chars are present  RSS feed

 
Greenhorn
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I can't seem to get the following regex right, I want see if there are any characters not defined in the regex, then I want to remove all valid chars from the string and leave only the invalid ones.

I have started with this

But the pattern should eventually only allow the following chars:


thanks
 
Taco Fleur
Greenhorn
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PS. the problme at the moment is that it always says it contains invalid chars, but when removing all valid chars nothing is left, i.e. there are no invalid chars.
 
Ranch Hand
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A character class only matches one character unless you add a quantifier:Also, the DOTALL flag is superfluous here, since you aren't using the dot metacharacter.
 
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