gsub (or gsub!) replaces a substring (first argument) with a replacement string (second argument)


puts "That's alll folks".gsub "alll", "all"

1.	gsub does multiple substitutions at once
2.	gsub method that performs a global substitution (like a search and replace) upon the string
3.	use gsub to eradicate the spaces from text string
4.	Splitting Text into Sentences
5.	Testing Sentence Separation
6.	gsub alll with all
7.	gsub lll with ll
8.	Normalize Ruby source code by replacing tabs with spaces
9.	Transform Windows-style newlines to Unix-style newlines
10.	Use whitespace as the place holder
11.	"FOO bar".gsub(/foo/i, "The bar").gsub(/bar/m, "result")
12.	"Here is number #123".gsub(/[a-z]/i, "#").gsub(/#/, "P")
13.	gsub(/[^\d]+/, '').split(//)

gsub (or gsub!) replaces a substring (first argument) with a replacement string (second argument) : gsub « String « Ruby