Need Help on Reg Exp

[kks_krishna]

HI,

 

I have the following code:

 

$link_url_id = preg_replace("/[^a-z0-9-]/","",strtolower(str_replace(" ","-",$link_text)));

 

If I give the input as :

 

Spring / Webwork2 Integration

 

It's giving the following output:

spring--webwork2-integration.html

 

Why its showing the multiple "--". I want it to be only one "-". should not be more than one "-" continuously.

 

Please help me.

[Psycho]

This will work, but I'm sure there is a more efficinet solution:

 

$link_url_id = preg_replace("/-{2,}/","-",preg_replace("/[^a-z0-9-]/","",strtolower(str_replace(" ","-",$link_text))));

 

[kks_krishna]

Thanks,

 

I need one more help from you.

" JBoss Seam book makes the JavaOne official best seller list ". If you look the string it has spaces in the start and end. When it converted it looks like this:

 

-jboss-seam-book-makes-the-javaone-official-best-seller-list-.html

 

How can I remove the starting and ending "-" from the string.

 

advance thanks for your help.

[Psycho]

trim()

[effigy]

<pre>
<?php
function urlize($string) {
	$string = trim($string);
	$string = strtolower($string);
	$string = preg_replace('/[^-a-z0-9 ]/', '', $string);
	$string = preg_replace('/\s+/', ' ', $string);
	$string = str_replace(' ', '-', $string);
	return "$string.html";
}
echo urlize('Spring / Webwork2 Integration');
echo '<br>';
echo urlize(' JBoss Seam book makes the JavaOne official best seller list ');
?>
</pre>

[kks_krishna]

Great dude.

 

Its working fine now. Thanks for your help.

[Wildbug]

Not to be contrary, but why not do it all in one line?

 

<?php

$string = preg_replace(array(
'/^[^a-z0-9]+/',
'/[^a-z0-9]+$/',
'/[^a-z0-9]+/'
),array(
'',
'',
'-'
),strtolower($string)) . '.html';

// ...or even...

$string = preg_replace(array(
'/^\W+/',
'/\W+$/',
'/\W+/'
),array(
'',
'',
'-'
),strtolower($string)) . '.html';

?>

 

The difference between the two is that the bottom one will preserve underscores (_) instead of turning them into dashes.  Also, in neither case will you ever get double dashes, whereas you can in effigy's function if a space and a dash are adjacent in the original string.

[Psycho]

Personally I prefer effigy's solution as it is more readable and easier to modify. To change it to remove double dashes would be simple enough:

 

<pre>
<?php
function urlize($string) {
	$string = trim($string); //trim whitespace from ends
	$string = strtolower($string); //Convert to lower case
	$string = preg_replace('/\s+/', '-', $string); //Replace any whitespace with dashes
	$string = preg_replace('/[^-a-z0-9]/', '', $string); //remove any non-supported characters
	$string = preg_replace("/-+/","-", $string); //Replace mutiple dashes with a single dash
	return "$string.html";
}
echo urlize('Spring- / Webwork2 - - -   Integration');
echo '<br>';
echo urlize(' JBoss Seam book makes the JavaOne official best seller list ');
?>

</pre>

[kks_krishna]

Thanks,

 

Its working like gem.