Ruby | String gsub Method

Last Updated : 12 Dec, 2019
gsub is a String class method in Ruby which is used to return a copy of the given string with all occurrences of pattern substituted for the second argument.
Syntax: str.gsub(pattern, replacement) Parameters: Here, str is the given string. pattern may be specified regex or character set to be removed. replacement is the set of characters which is to be put. Returns:A copy of the string with all occurrences of pattern substituted for the second argument.
Example 1: Ruby 
# Ruby program to demonstrate 
# the gsub method 
     
# Taking a string and 
# using the method
puts "Sample".gsub(/[amuyt]/, '*')                 
puts "Program".gsub(/([gmra])/, '<\1>')
Output: 
S**ple
Po
Example 2: Ruby 
# Ruby program to demonstrate 
# the gsub method 
     
# Taking a string and 
# using the method
puts "Ruby".gsub(/[tyru]/, '<\1>')                 
puts "String".gsub(/([igtr])/, '*')
Output: 
Rb
S***n*
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