escape regex replacement string

escape-regex-replacement-string.sh

#!/usr/bin/env bash

# Return a string that's escaped and ready to be used as
# the replacement string in a basic regular expression.
# Reference: https://unix.stackexchange.com/questions/32907/what-characters-do-i-need-to-escape-when-using-sed-in-a-sh-script/33005#33005

escape_regex_replacement_string() {
	# Reference: https://github.com/koalaman/shellcheck/wiki/SC2001
	string=$1
	if [[ $string =~ \\ ]]; then
		string=${string//\\/\\\\}
	fi
	if [[ $string =~ '&' ]]; then
		string=${string//&/\\&}
	fi
	echo "$string"
}