How to get capturing group functionality in Go regular expressions

Question

I\'m porting a library from Ruby to Go, and have just discovered that regular expressions in Ruby are not compatible with Go (google RE2). It\'s come to my attention that Ru

Answer 1

I had created a function for handling url expressions but it suits your needs too. You can check this snippet but it simply works like this:

/**
 * Parses url with the given regular expression and returns the 
 * group values defined in the expression.
 *
 */
func getParams(regEx, url string) (paramsMap map[string]string) {

    var compRegEx = regexp.MustCompile(regEx)
    match := compRegEx.FindStringSubmatch(url)

    paramsMap = make(map[string]string)
    for i, name := range compRegEx.SubexpNames() {
        if i > 0 && i <= len(match) {
            paramsMap[name] = match[i]
        }
    }
    return
}

You can use this function like:

params := getParams(`(?P\d{4})-(?P\d{2})-(?P\d{2})`, `2015-05-27`)
fmt.Println(params)

and the output will be:

map[Year:2015 Month:05 Day:27]