this probably get's asked a lot, but I'm having trouble understanding preg_replace()


I want to turn @post-31 into <a href="#post-31">@post-31</a>



this is what I've got, obviously doesn't work

PHP Code:

$text = preg_replace('/^@post-[0-9]/', '<a href=""></a>', $post_data['text']); 


PHP Code:

$text = preg_replace('/^@post-([0-9]+)$/', '<a href="#post-$1">@post-$1</a>', $post_data['text']); 


Originally Posted by mgraphic

PHP Code:

$text = preg_replace('/^@post-([0-9]+)$/', '<a href="#post-$1">@post-$1</a>', $post_data['text']); 


thanks! though still seems to need some work, only works with 1 digit numbers?

Originally Posted by Skeddles

thanks! though still seems to need some work, only works with 1 digit numbers?

Using the + will capture one or more in the number set, so it will capture 9 or 99 or 999999. The replace string will replace the $1 with the captured value.

Originally Posted by mgraphic

Using the + will capture one or more in the number set, so it will capture 9 or 99 or 999999. The replace string will replace the $1 with the captured value.

well in my code it appears to only work with 1, @post-4 get's linked, @post-47 does not. EDIT: or something else must be wrong... now nothing works, it worked only on one entry, even if i had the same text on others, and then I deleted it and now none work... this is weird.

PHP Code:

<?php

$text = preg_replace('/^@post-([0-9]+)$/', '<a href="#post-$1">@post-$1</a>', "@post-4 @post-0 @post-22 @post-2 @post-12 @post-2 @post-21");

echo $text;

?>

doesn't work

OK, I didn't realize you would have a string with multiple matches, using the ^ and $ in the pattern string was only matching the first set.

PHP Code:

$text = preg_replace('/@post-([0-9]+)/', '<a href="#post-$1">@post-$1</a>', '@post-4 @post-0 @post-22 @post-2 @post-12 @post-2 @post-21'); 


Originally Posted by mgraphic

OK, I didn't realize you would have a string with multiple matches, using the ^ and $ in the pattern string was only matching the first set.

PHP Code:

$text = preg_replace('/@post-([0-9]+)/', '<a href="#post-$1">@post-$1</a>', '@post-4 @post-0 @post-22 @post-2 @post-12 @post-2 @post-21'); 


oh cool, works, thank you