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package main

import (
	"regexp"
	"strings"
)

func re(s, r string) string {
	// min: s//
	if len(s) < 3 {
		return ""
	}
	z := strings.Split(r[2:], string(r[1]))
	// match s// and s///
	if len(z) < 2 || len(z) > 3 {
		return ""
	}
	re, err := regexp.Compile(z[0])
	if err != nil {
		return ""
	}
	return re.ReplaceAllString(s, z[1])
}