Regular Expression Problem

[rfontaine]

Hi,

I admit I am terrible at regex. I have some pages with a bunch of text, within which includes:

top:1234
top:1244
top:1264
etc

I would like to subtract 1000 from all the numbers associated with "top:" only, and no other numbers.

Here is my (bad) regex attempt, but alas, it does not seem to work...any ideas?

$content = preg_replace("/top:([0-9]*)$1/i",${1} - 1000,$content);

Any help greatly appreciated.

[dcrombie]

The e modifier makes preg_replace [php.net] treat the replacement parameter as PHP code after the appropriate references substitution is done.

;)

[rfontaine]

You mean like this?

$content = preg_replace("/top:([0-9]*)$1/e",${1} - 1000,$content);

[edited by: jatar_k at 6:23 pm (utc) on July 28, 2005]
[edit reason] turned off smilies [/edit]

[dcrombie]

Close (-;

$content = preg_replace("/top:([0-9]+)/e", "\$1 - 1000", $content);