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Use regular expressions to match multiples of 3

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WBOYOriginal
2016-07-25 08:47:211432browse
Code comes from: http://www.zhihu.com/question/24824487

It is recommended to use Regexp Match Tracer to test regularity
  1. ^[0369]*(([147][0369]*|[258][0369]*[258][0369]*)([147][0369]*[258][0369]*) *([258][0369]*|[147][0369]*[147][0369]*)|[258][0369]*[147][0369]*)*$
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Use regular expressions to match multiples of 3


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