Feature Request Transform - Replace Pattern to support substitution

[aprvital2000]

transform/replace_pattern
transform/replace_all_patterns
support replacement string, but not substitution.
Ex:-
Input pattern :- testing credit card 1234-5678-9012-3456.
Input replacement :- x-x-x-$4
Expected Output :- testing credit card x-x-x-3456.
Actual Output :- testing credit card x-x-x-$4.

Following is the Golang test program

package main

import (
"regexp"
"fmt"
)

func main() {
var re = regexp.MustCompile((?m)([0-9]{4})[-]*([0-9]{4})[-]*([0-9]{4})[-]*([0-9]{4}))
var str = testing credit card 1234-5678-9012-3456.
var substitution = "--*-$4"

fmt.Println(re.ReplaceAllString(str, substitution))

}