The method Regexp#match matches a regular expression against a string.



# If unsuccessful,the method returns nil.
# On success,it returns an instance of class MatchData. 
# And that MatchData object gives you access to all available in formation.

re = /cat/ 
puts re.class # Regexp 


re = /(\d+):(\d+)/ # match a time hh:mm 
md = re.match("Time: 12:34am") 
puts md.class 
puts md[0] 
puts md[1] 
puts md[2] 
puts md.pre_match 
puts md.post_match

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The method Regexp#match matches a regular expression against a string. : Regexps « Development « Ruby

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