This question already has an answer here:
In one codebase (PHP) I'm working on currently there is this regular expression:
!([a-z0-9]*)\.([a-zA-Z0-9]{3,4})
Which supposedly should match something like this:
a1213asddaa13124312ada.12ws
And yet it does not happen. Matching occurs only with this expression:
([a-z0-9]*)\.([a-zA-Z0-9]{3,4})
Can anybody clarify?
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! has no special meaning. It'll match a literal exclamation mark. a1213asddaa13124312ada.12ws does not start with one.