Java之正则表达式之简写符号

 // 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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