CODEWITHSUNDEEP
phpregexurl
Orafu James
Orafu James

Reputation: 31

Regular Expression to extract a url included in a string

I looked around for a while, but probably I can't "Google" with the proper keywords, so I'm asking here. I need to extract the url from a string, using regexp (php)

A simple example should be helpful:

Target: extract the url http://en.wikipedia.org/wiki/Kettle

Base string: 

/url?q=http://en.wikipedia.org/wiki/Kettle&sa=U&ei=VpnIUP22Js3B0gWKhoCgCQ&ved=0CB0QFjAA&usg=AFQjCNGS7-bieZB8Vh7xR5sjOy-KT86ANQ

Upvotes: 1

Views: 103

Answers (2)

ke20
ke20

Reputation: 665

Test this regex: /q=([^&]+)/i 

<?php
  $url = '/url?q=http://en.wikipedia.org/wiki/Kettle&sa=U&ei=VpnIUP22Js3B0gWKhoCgCQ&ved=0CB0QFjAA&usg=AFQjCNGS7-bieZB8Vh7xR5sjOy-KT86ANQ';
  $pattern = '/q=([^&]+)/i';
  preg_match($pattern, $url, $res);
  echo $res[1];
?>

Upvotes: 0

Martin Ender
Martin Ender

Reputation: 44259

There are better options than regex to do this. For instance, PHP provides the two functions parse_url and parse_str which do exactly what you want:

$query = parse_url($string, PHP_URL_QUERY);
parse_str($query, $parameters);
$result = $parameters['q'];

That is, of course, only unless you need to use regular expressions, because that is all your framework provides or because it's some kind of exercise.

Upvotes: 4

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