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Find pattern in PHP string

Posted on 2013-01-03
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Last Modified: 2013-01-03
Hi,

In order to facilitate multiple countries, each country will have a website URL as below:

http://www.somewhere.com/ie/index.html       (for Ireland)
http://www.somewhere.com/fr/index.html       (for France)

I'm trying to extract the 2 character country code between the forwardslashes (it will always be 2 characters long). I'm guessing I need a Regexp but I have no idea how to use them.

In English, the pattern would be /XX/ where XX is what needs to be stored in a PHP variable. The position of the string /XX/ would not be fixed as I need this working using http://localhost/folder as well as http://server/folder and http://www........

Can somebody please provide some direction on how I can get started?

Thanks in advance
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Question by:kbit
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6 Comments
 
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Accepted Solution

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Marco Gasi earned 500 total points
ID: 38740284
Assuming you have in your urls only and only one group of two letters you can use this:

preg_match('%(?<=/)\w\w(?=/)%sim', $url, $matches);
$country = $matches[0];
echo $country;

Cheers
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LVL 12

Expert Comment

by:Chris
ID: 38740325
Here is another method (which I find easier to understand as regexps frankly hurt my head). This will work provided the country code always comes immediately after the DNS name.

<?php

$string = "http://www.somewhere.com/ie/index.html";

$resultArray = explode("/",$string,5);
$countryCode = $resultArray[3];
echo "Country Code is " . $countryCode;

?>
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Expert Comment

by:Marco Gasi
ID: 38740413
@Demented_Goose: with no offense, but your code will work fine only if you know exactly where the searched token is within the string, but if that place can change like:

http://localhost/folder/fr/index.html
http://server/folder/fr/index.html

In these cases, your code returns 'folder' as Country Code. In addition, limiting to 5 the exploding process make the code fail with long url such as:

http://localhost/folder/subfolder/subsubfolder/fr/anothersubfolder/index.html

Cheers
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Author Closing Comment

by:kbit
ID: 38740613
Many thanks for such a quick and thorough reply, this worked perfectly
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Expert Comment

by:Chris
ID: 38740957
@marqusG. This is correct and I did actually explain this in my original post - "This will work provided the country code always comes immediately after the DNS name.".

At the end of the day, if it is known that the country code will always be after the hostname then the explode method will work every time.

I could take your example and say "What if there's a URL of http://host/12/uk/somethingelse.htm ?"

The country code that should be extracted is "uk" but your regexp will return "12" - not exactly ideal. At the end of the day both methods work as long as you can be sure of the format of the URL.
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LVL 31

Expert Comment

by:Marco Gasi
ID: 38741686
@Demented_Goose: you're right, I didn't consider that case and it made me think about the best way to manage all possible situations. Maybe a good way is the following:

$url = "http://host/12/uk/somethingelse.htm ";
preg_match('%(?<=/)[A-Za-b]{2}(?=/)%sim', $url, $matches);
$country = $matches[0];
echo $country;

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This way, only letters will be found.

Cheers
Marco
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