Mongo get duplicate field by using regular expression

mongo-get-duplicate-field.go

package main

import (
	"fmt"
	"regexp"
)

func main() {
	errStr := `rpc error: code = AlreadyExists desc = multiple write errors: [{write errors: [{E11000 duplicate key error ` +
		`collection: mai_webmin_inventory_service.groups index: unique_name dup key: { name: "aa1234" }}]}, {<nil>}]`
	r := regexp.MustCompile(`(dup key: )(.*)(}]},)`)
	dupField := r.FindStringSubmatch(errStr)[2]
	fmt.Println(dupField)
}