M4 Regexp Examples

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Regexp Explanation
.* everything
^[0-9]+$ only digits
^\+?[0-9]+$ + sign and only digits
^370[0-9]+$ only digits starting with 370
^370.*$ anything starting with 370
^(37[0-1])|(44)[0-9]*$ only digits starting with 370 or 371 or 44




See also