Apart from "g", how to replace all characters from a string with a " "?

Question

How do I remove all characters, numbers and symbols except for "g" from a string and replace it with a " "?

string = "bi2gger 1is 00ggooder"

Answer 1

gsub is overkill here. Use String#tr:

string = "bi2gger 1is 00ggooder"
string.tr("^g", " ")
# => "   gg         gg     "

This will return a new string. To instead modify the original string, use tr!.

See it on repl.it: https://repl.it/KJPY