The part of a string matched by a regular expression can be replaced : Regexps Repetition « Development « Ruby

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Ruby » Development » Regexps Repetition   The part of a string matched by a regular expression can be replaced line = "this is a Perl. And this a Python" puts line line.sub(/Perl/, 'Ruby')    # replace first 'Perl' with 'Ruby'  puts line line.gsub(/Python/, 'Ruby') # replace every 'Python' with 'Ruby'  puts line   Related examples in the same category 1.  Repetition 2.  have Repetition match the minimum by adding a question mark suffix. 3.  use part of the current match later in that match allows you to look for various forms of repetition. 4.  use back references to match delimiters. 5.  A pattern that matches a string containing the text Perl or the text Python 6.  Use parentheses within patterns,just as you can in arithmetic expressions 7.  You can also specify repetition within patterns. 8.  match one of a group of characters within apattern 9.  Match a time such as 12:34:56 10.  Match Perl, zero or more other chars, then Python 11.  Match Perl, a space, and Python 12.  Match Perl, zero or more spaces, and Python 13.  Match Perl, one or more spaces, and Python 14.  Match Perl, whitespace characters, then Python 15.  Match Ruby, a space, and either Perl or Python 16.  The match operator =~ can be used to match a string against a regular expression. 17.  Replace every occurrence of Perl and Python with Ruby

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