Ruby速查 -- 匹配/查找字符串
ruby 代码[*]/\d\d:\d\d:\d\d/ # a time such as 12:34:56
[*]/Perl.*Python/ # Perl, zero or more other chars, then Python
[*]/Perl Python/ # Perl, a space, and Python
[*]/Perl *Python/ # Perl, zero or more spaces, and Python
[*]/Perl +Python/ # Perl, one or more spaces, and Python
[*]/Perl\s+Python/ # Perl, whitespace characters, then Python
[*]/Ruby (Perl|Python)/ # Ruby, a space, and either Perl or Python
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