Regex that match multiple format to extract aws accountid-CodePudding

I want to use one regex to extract the aws account id for two types of format

arn:aws:ec2:us-west-2:1234567890:instance/i-0a89fdbedc3f1d76a
arn:aws:iam::1234567890:instance-profile/aws-elasticbeanstalk-ec2-role

I.e., the regex should be able to match 1234567890 in both lines.

I know how to create regex for each format, but want to have one single regex if possible.

CodePudding user response：

I'd use the following regexp: arn:aws:(?:ec2|iam):[^:]*:([0-9] ): The prefix is arn:aws:, followed by either ec2 or iam and one may-be-empty segment. After the prefix there must be a non-empty group of digits. It is exactly the group with the instance number.

Example https://go.dev/play/p/mP6VyIYa3v_N

CodePudding user response：

Dont need RegExp, just pick out the fifth column:

package aws

import (
   "strconv"
   "strings"
)

func extract(s string) (int, error) {
   split := strings.SplitN(s, ":", 6)
   return strconv.Atoi(split[4])
}

https://godocs.io/strings#SplitN