// Pattern. /* digits : \d = [0-9] words : \w = [A-Za-z0-9_] space characters : \s = [ \t\r\n\v\f] boundaries : \b = (?<=\W)(?=\w)|(?<=\w)(?=\W) ______________________________________________________________ https://en.wikipedia.org/wiki/Regular_expression */
最容易搞混的就是
\s 是 space 而不是 string !
\b 是 boundary 而不是 blank !
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