switch(string) - pattern matching?

[Vincent Ambo]

Hej,

If I use a switch statement on a string var, is it possible to get cases by pattern matching? (regex or formatstrings)

For example:
var s string
switch(s) {
case "%02d.%04d":

etc.

I'm not on a computer where I can test this at the moment but I'm trying to get some code done anyways. Help much appreciated!

Thanks in advance,
Vincent

Skickat från min iPhone

[Olivier Gagnon]

You can try code in the sandbox on the main page of http://golang.org/.

[Andy Balholm]

No, switch only works with exact equality, not with pattern match.

But you could use a boolean switch:

package main

import (

"fmt"

"regexp"

)

var twoPointFour = regexp.MustCompile(`^[0-9][0-9]\.[0-9][0-9][0-9][0-9]$`)

var twoPointTwo = regexp.MustCompile(`^[0-9][0-9]\.[0-9][0-9]$`)

func main() {

s := "12.3456"

switch {

case twoPointFour.MatchString(s):

fmt.Println("2.4")

case twoPointTwo.MatchString(s):

fmt.Println("2.2")

default:

fmt.Println("It doesn't match")

}

}

Andy

[Kyle Lemons]

You can use switch{} (the short form of switch true {}) to achieve a similar effect:

from https://gist.github.com/1154473 :

var email = regexp.MustCompile(`^[^@]+@[^@.]+\.[^@.]+`)
var shortPhone = regexp.MustCompile(`^[0-9][0-9][0-9][.\-]?[0-9][0-9][0-9][0-9]`)
var longPhone = regexp.MustCompile(`^[(]?[0-9][0-9][0-9][). \-]*[0-9][0-9][0-9][.\-]?[0-9][0-9][0-9][0-9]`)
// ...
switch {
case email.MatchString(contact):
  fmt.Println(contact, "is an email")
case shortPhone.MatchString(contact):
  fmt.Println(contact, "is a short phone number")
case longPhone.MatchString(contact):
  fmt.Println(contact, "is a long phone number")
default:
  fmt.Println(contact, "is not recognized")
}