Regexp

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Regexp is the class for representing regular expressions in Ruby. It provides a clean way to find the pre-match, post-match and other match data.

Here is an example 

 timeexp = Regexp.new(/(\d+)\:(\d+)\:(\d+)/)
 matchdata = timeexp.match(Time.now.to_s)
 matchdata[0] #gives the current time
 matchdata.pre_match #day
 matchdata.post_match #offset from UTC and the year
Retrieved from "http://spec.ruby-doc.org/wiki/Regexp"
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