ereg_relpace urls?

[scbmx]

how can i replace a url such as <a href="images/pic.gif">hi</a> with <a href="http://url.com/images/pic.gif">hi</a> ?

thanks in advance for any help

[ednark]

<?php

## SET TO DIPLAY AS PLAIN TEXT SO YOU CAN SEE THE HTML 
header('Content-type: text/plain');

## set the base url you want to put on all your links
$base_url = "http://www.foobar.baz/";

## this function is just a wrapper for eregi_replace
function giveBaseUrl( $string )
{
  ## bring the base_url into this scope
  global $base_url;
  ## find any <a href=" or <img src=" that already do not already have http :// and plop base_url

  ## this is the beef here
  ## replace with code below
  return eregi_replace( , , $string );

}


## define a string that has <img> and <a> tags with bare addresses
$old =<<<_STRING
<a href="foobar.html">link</a>

<A HREF="foobar.html"><img src="foobar.png" /></A>
_STRING;

## run the function on this string
$new = giveBaseUrl( $old );

## print out the old and new string so you can see what this does
print <<<_TEXT
:::: OLD STRING

$old


:::: NEW STRING

$new

_TEXT;

?>

can't seem to make the regex display right within the [ php] tag of this board so here it is

eregi_replace('(<a href=[\'\"]|<img src=['\"])([^{h][t][t][p][:][\/][\/])',} "\1$base_url\2", $string );

[scbmx]

hmm this is wierd... it works for some links, but any link with just the chars: "h", "t", and "p", it ignores. any reason for this?

[ednark]

well my ereg powers are much more limited thant my preg powers...

I just don't know how to do a negative lookahead assertion with the ereg() functions

i tried to simulate it with
NOT H, NOT T, NOT T, NOT T, NOT P
[^h][t][t][p]
but i guess thats not write

if you don't mind using preg() then plop this guy in and you are good to go...

return preg_replace( '/((<a href|<img src)=[\"\'])(?!http:\/\/)/i', "$1$base_url", $string );

anyone who knows how to do this in ereg() polease post i would be interested