Go Language: A way to tokenize a string

Question

I have a Go Program where I need to search through multiple strings for a specific pattern. The Strings all look like this:

 Destination: 149.164.31.169 (149.164.31.169)

I'd like to just extract the IP 149.164.31.169, either the middle one or the one in parenthesis, they will always be the same. In Java I would do something along the lines of using a string tokenizer to gather the part of the string I need, but I didnn't find a function similar in go.

Does anyone know how I can achieve this?

Rob Napier · Accepted Answer · 2015-09-24 01:00:25Z

21

You can just split on spaces and take the middle one:

s := "Destination: 149.164.31.169 (149.164.31.169)"
parts := strings.Split(s, " ")
if len(parts) != 3 {
    panic("Should have had three parts")
}
println(parts[1])

There are lots of other approaches. The strings package is the place to look. Of course if you need something much more complex, you can look at regex for regular expressions, but that'd be overkill here. If you really need a tokenizer, look at text/scanner, but again, that's way too much for this.

answered Sep 24, 2015 at 1:00

Rob Napier

301k37 gold badges492 silver badges660 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

btald1331 Over a year ago

Thank you, this worked great, and is very similar to tokenizer.

insanely_sin Over a year ago

How do we handle multiple separators ?

Zombo · Accepted Answer · 2021-05-28 14:14:08Z

0

You can also use fmt.Sscanf for this:

package main
import "fmt"

func extractIP(s string) string {
   var ip string
   fmt.Sscanf(s, "Destination: %v", &ip)
   return ip
}

func main() {
   ip := extractIP("Destination: 149.164.31.169 (149.164.31.169)")
   fmt.Println(ip == "149.164.31.169")
}

https://golang.org/pkg/fmt#Sscanf

answered May 28, 2021 at 14:14

Zombo

1

Collectives™ on Stack Overflow

Go Language: A way to tokenize a string

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related