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This is a statement from JavaScript regular expression description:
^has a different meaning when it appears as the first character in a character set pattern.
For example,/[^a-z\s]/matches the'3'in"I have 3 sisters".
How does ^ match 3?
the
^opearator here means negation, it means that match any character which is not a space or alphabet(a-z). It will still match capital alphabets(A-Z)You can refer this url: http://www.regular-expressions.info/reference.html for more information on regular expressions