Help with RegEx replace

[roydukkey]

Here is the what i need to happen. Much thanks to anyone willing to help.

 

I need to replace 'f=varying-string' from 'f=varying-string&killer=lop&you=pop'.

 

The string need to be replaced no matter where it is. ie. 'killer=lop&f=varying-string&you=pop'

 

I'm trying this:

 

preg_replace( "/^[f=].*(^&.*$)$/is", "", $_SERVER['QUERY_STRING'] );

[ghostdog74]

i don't understand what you mean by "no matter where it is", but anyhow, here's something non regex

,

$str = "f=varying-string&killer=lop&you=pop";
$s = explode("&",$str);
$tmp=$s[0];
$s[0]=$s[1];
$s[1]=$tmp;
print implode("&",$s);

[jayjay960]

Try:

 

/\bf=\b.+/

[thebadbad]

There are built in PHP functions for this:

 

<?php
parse_str($_SERVER['QUERY_STRING'], $data);
unset($data['f']);
echo http_build_query($data);
?>

 

Note that http_build_query() requires PHP 5.

[roydukkey]

Thanks all for you posts. thebadbad had the answer i was looking for thanks!