[FEATURE] Replace with regex

[DenuxPlays]

New feature motivation

Would be nice if we could have a function that allows us to replace using regexes.

New feature description

Uses a regex to replace with the given string so basically just call String.replace() fucntion with user input.
The user would be able to enter a regex and the string that is the replacement.

New feature implementation

call .replace() on user input and with user input.