can someone explained what is the difference between this code [^a-z^0-9] and this code [^a-z][^0-9]?
This means do not match characters in the range a-z-0-9
This means do not match characters in the range a-z followed by the numbers in range 0-9. The question mark implies 0 or 1 match or simply implies the [0-9] match is optional
that makes so much sense. thank you!
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