How Can I Replicate Ruby's Named Capturing Groups in Go Regular Expressions?

Getting Capturing Group Functionality in Go Regular Expressions

Regular expressions in Go (using the google RE2 library) differ from those in Ruby that support capturing groups. Therefore, when porting code from Ruby, it becomes necessary to rewrite regular expressions to be compatible with Go.

For example, consider the Ruby regular expression:

(?<Year>\d{4})-(?<Month>\d{2})-(?<Day>\d{2})

This expression captures the year, month, and day into named capturing groups, allowing easy retrieval. To achieve similar functionality in Go, add some Ps as defined in the following:

(?P<Year>\d{4})-(?P<Month>\d{2})-(?P<Day>\d{2})

Cross-reference the capture group names with re.SubexpNames():

package main

import (
    "fmt"
    "regexp"
)

func main() {
    r := regexp.MustCompile(`(?P<Year>\d{4})-(?P<Month>\d{2})-(?P<Day>\d{2})`)
    fmt.Printf("%#v\n", r.FindStringSubmatch(`2015-05-27`))
    fmt.Printf("%#v\n", r.SubexpNames())
}

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