Scala regex extract domain from urls

Question

I want to extract bell.com from these following input using Scala regex. I have tried a few variations without success.

"www.bell.com"
"bell.com"
"http://www.bell.com"
"https://www.bell.com"
"https://bell.com/about"
"https://www.bell.com?token=123"

This is my code but not working.

val pattern = """(?:([http|https]://)?)(?:(www\.)?)([A-Za-z0-9._%+-]+)[/]?(?:.*)""".r
url match {
  case pattern(domain) =>
    print(domain)
  case _ => print("not found!")
}

EDIT: My regex is wrong. Thanks to @Tabo. This is correct one.

(?:https?://)?(?:www\.)?([A-Za-z0-9._%+-]+)/?.*

How will you handle subdomains? Your problem may be intractable. — wheaties
– wheaties, Commented Mar 26, 2015 at 20:02
@jcdyer Can you please provide an example so I can approve your answer? — angelokh
– angelokh, Commented Mar 26, 2015 at 20:43
@jcdyer I found this. github.com/NET-A-PORTER/scala-uri Is this what you mean? — angelokh
– angelokh, Commented Mar 26, 2015 at 20:50
@angelokh: Sorry. I hadn't been on SO in a while. Looks like you got an answer. — jcdyer
– jcdyer, Commented Apr 23, 2015 at 20:10

Eugene Zhulenev · Accepted Answer · 2015-03-26 20:52:46Z

7

You can use Java URL class to get Host, or you can check Apache library

new URL("https://www.bell.com?token=123").getHost

answered Mar 26, 2015 at 20:52

Eugene Zhulenev

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Keith Pinson · Accepted Answer · 2015-03-26 20:59:34Z

6

You can try:

import java.net.URL
import util.Try

val t = "https://www.bell.com?token=123"

val url = Try { new URL(t) }.toOption

answered Mar 26, 2015 at 20:59

Keith Pinson

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Ian Tabolt · Accepted Answer · 2015-03-27 02:16:27Z

1

You should probably use the java.net.URLmethod, but...

For future reference, you have a couple of issues in your regex. Square brackets match character sets so [http|https] is the same as [htps|] (meaning 'h', 't', 'p', 's', or '|'). I think you mean http|https or simply https?.

Also, if you are only trying to match just the domain, you want to only have one capturing group. Note that (?:blah) denotes a non-capturing group, while (blah) is a capturing group. The three capturing groups in your regex are ([http|https]://), (www\.)?, and ([A-Za-z0-9._%+-]+). You really only want the last one.

Try:

(?:https?://)?(?:www\.)?([A-Za-z0-9._%+-]+)/?.*

Test it here - https://regex101.com/r/xW4iY7/2

answered Mar 27, 2015 at 2:16

Ian Tabolt

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