// 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)
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https://en.wikipedia.org/wiki/Regular_expression
*/
[size=medium]最容易搞混的就是 [/size]
[size=medium][color=blue][b]\s[/b][/color] 是 [color=brown][b]space[/b][/color] 而不是 string ![/size]
[size=medium][color=blue][b]\b[/b][/color] 是 [color=brown][b]boundary[/b][/color] 而不是 blank ![/size]
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