Replace in Ruby

In Ruby, you can replace a substring with the gsub (global substitution) method. The syntax for using gsub is:

``ruby string.gsub("substring_to_replace", "replacement_substring")



Here's an example:

ruby

sentence = "The quick brown fox jumps over the lazy dog."

new_sentence = sentence.gsub("lazy", "sleeping")

puts new_sentence



This code will output:


The quick brown fox jumps over the sleeping dog.



In this example, we used the gsub method to replace the substring "lazy" with "sleeping". The method returns a new string with the substitution made.
You can also use regular expression (regex) patterns to replace multiple occurrences of a substring. For example:
ruby

string = "Ruby is the best programming language. Python is great too!"

new_string = string.gsub(/\b(Ruby|Python)\b/, "\\1")

puts new_string



This code will output:


Ruby is the best programming language. Python is great too!

In this example, we used a regex pattern to match the substrings "Ruby" and "Python", and used the backslash followed by a number to insert the matched substring within the replacement string. We also used the \b` regex character to match word boundaries and ensure we only replace whole words.

Replace in Ruby

See this concept in other languages