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Your regular expression
/ /
Your test string
Match result
\b Any word boundary character . Any single character (a|b) a or b
\s Any whitespace character([ \f\n\r\t\v]) ^ Start of line a? Zero or one of a
\d Any digit([0-9]) $ End of line a* Zero or more of a
\D Any non-digit([^0-9]) [abc] A single character a+ One or more of a
\w Any word character([A-Za-z0-9_]) [^abc] Any single character a{3} Exactly 3 of a
\W Any non-word character [a-z] Any single character in the range a-z a{3,6} Between 3 and 6 of a