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

how should I re-write these expressions?

Add some Ps, as defined here:

(?P\d{4})-(?P\d{2})-(?P\d{2})

Cross reference capture group names with re.SubexpNames().

And use as follows:

package main

import (
    "fmt"
    "regexp"
)

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