php extract variable from a string using regexp

[Ciaran]

Hi can someone give me hand with this please?


What's the best way to extract the extension from the url?

example:
$string="http://www.domain.co.u k/anypage.html"
In this example, I'd be looking for: "co.uk" but it could be "com",
"net" , or any other extension

Thanks
Ciarán

[Rik]

Re: php extract variable from a string using regexp

On Tue, 17 Jul 2007 21:28:00 +0200, Ciaran <cronoklee@hotm ail.comwrote:

Hi can someone give me hand with this please?
>
>
What's the best way to extract the extension from the url?
>
example:
$string="http://www.domain.co.u k/anypage.html"
In this example, I'd be looking for: "co.uk" but it could be "com",
"net" , or any other extension

Why? And there is no easy way to allow for 'double extentions' like co.uk
whithout you giving it a list of accepted doubles. There's no 'logical'
way to allow for this.

Well, to get the TLD:

$string ="http://www.domain.co.u k/anypage.html";

//NON REGEX WAY:
$urlinfo = parse_url($stri ng);
$domaincomponen ts = explode('.',$ur linfo['host']);
$extention = end($domaincomp onents);

//REGEX
preg_match('%
^ #match at start
(?:[a-z]+://)? #possible protocol
[^/]*? #domainstring
([^/.]+) #TLD
(?:/|$) #start of path or end of string
%six',$string,$ match);
$extention = $match[1];

If you want to allow for doubles, you'll have to provide a list of
acceptable 'doubles', and match it to the end of the hostname.

--
Rik Wasmus

[Toby A Inkster]

Re: php extract variable from a string using regexp

Rik wrote:

If you want to allow for doubles, you'll have to provide a list of
acceptable 'doubles', and match it to the end of the hostname.

http://publicsuffix.org/list/

If I get bored this evening I might have a go.

--
Toby A Inkster BSc (Hons) ARCS
[Geek of HTML/SQL/Perl/PHP/Python/Apache/Linux]
[OS: Linux 2.6.12-12mdksmp, up 27 days, 17:51.]

PHP Linkifier

http://tobyinkster.co.uk/blog/2007/07/18/linkify/

[Ciaran]

Re: php extract variable from a string using regexp

On Jul 17, 8:59 pm, Rik <luiheidsgoe... @hotmail.comwro te:

On Tue, 17 Jul 2007 21:28:00 +0200, Ciaran <cronok...@hotm ail.comwrote:

Hi can someone give me hand with this please?

>

What's the best way to extract the extension from the url?

>

example:
$string="http://www.domain.co.u k/anypage.html"
In this example, I'd be looking for: "co.uk" but it could be "com",
"net" , or any other extension

>
Why? And there is no easy way to allow for 'double extentions' like co.uk
whithout you giving it a list of accepted doubles. There's no 'logical'
way to allow for this.
>
Well, to get the TLD:
>
$string ="http://www.domain.co.u k/anypage.html";
>
//NON REGEX WAY:
$urlinfo = parse_url($stri ng);
$domaincomponen ts = explode('.',$ur linfo['host']);
$extention = end($domaincomp onents);
>
//REGEX
preg_match('%
^ #match at start
(?:[a-z]+://)? #possible protocol
[^/]*? #domainstring
([^/.]+) #TLD
(?:/|$) #start of path or end of string
%six',$string,$ match);
$extention = $match[1];
>
If you want to allow for doubles, you'll have to provide a list of
acceptable 'doubles', and match it to the end of the hostname.
>
--
Rik Wasmus

Hey thanks a lot Rik, This helps a lot!

[Toby A Inkster]

Re: php extract variable from a string using regexp

Toby A Inkster wrote:

http://publicsuffix.org/list/

If I get bored this evening I might have a go.

OK -- I've written a PHP class that is capable of extracting whichever
components you like out of a hostname, including its "effective TLD"
that is:

Host ETLD
--------------------------------------------
groups.google.c o.uk. co.uk.
www.ealing.nhs.uk. nhs.uk.
www.ipart.nsw.gov.au. nsw.gov.au.
www.google.com. com.
www.last.fm. fm.
www.british-library.uk. uk.
del.icio.us. us.

The syntax for this is:

<?php
include "Domain.class.p hp";
$x = new Domain('www.eal ing.nhs.uk');
echo $x->get_reg_domain ()."\n"; // ealing.nhs.uk.
echo $x->get_etld()."\n "; // nhs.uk.
echo $x."\n"; // www.ealing.nhs.uk.
?>

Link to download is in my signature below...

--
Toby A Inkster BSc (Hons) ARCS
[Geek of HTML/SQL/Perl/PHP/Python/Apache/Linux]
[OS: Linux 2.6.12-12mdksmp, up 28 days, 13:08.]

PHP Domain Class

http://tobyinkster.co.uk/blog/2007/07/19/php-domain-class/