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

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Ruby » Development » Regexps   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   Related examples in the same category 1.  Regexps use elements to instruct the regular expression engine on how to find a given string. 2.  An example of a regular expression used to match a string with the String method scan. 3.  Search for a word from the very beginning 4.  Looking for a word 5.  grep(/men/) 6.  grep(/m[ae]n/) 7.  grep(/men|man/) 8.  grep(/m(e|a)n/) 9.  grep(/^When in/) 10.  grep(/outcast state,$/) 11.  grep(/\Aen in/) 12.  grep(/e n,\z/) 13.  grep(/[\(\d\d\d\)]?\d\d\d-\d\d\d\d/) 14.  grep(/colou?r/) 15.  grep(/[\(\d+\)]?\d+-\d+/) 16.  grep(/[\(\d{3}\)]?\d{3}-\d{4}/) 17.  Implementing Class and Singleton Methods 18.  Match a time 19.  Match Perl, zero or more other chars, then Python 20.  Match Perl, a space, and Python 21.  Match Perl, zero or more spaces, and Python 22.  Match Perl, one or more spaces, and Python 23.  Match Perl, whitespace characters, then Python 24.  Match Ruby, a space, and either Perl or Python 25.  Match a regular repression in if statement 26.  sub and gsub replace with regular expressions 27.  Replace Perl or Python with Ruby 28.  MatchData-related $-variables are in $~

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