need help Regular expression php

[joomphp]

hi!
i have some html code like this

The Chihuahua Desert <a href="index.php">Dirt</a> Fest is <a href="/index.php">coming <a/>up, next February 17-19. <a href="http://google.com">Three</a>

i want to replace /index.php with http://google.com
and index.php with http://google.com/

and idea how can i do this

[joomphp]

i need need to replace hyperlinks
like this way

3 cases
case 1 : link
case 2 : link
case 3 : link

i want to replace case 2 /index.html with http://google.com/index.html
and case 3 index.html with http://google.com/index.html

and skip case 1

please help me how to do this in php

[pritaeas]

I think you can best match the domain and the path separately, and then merge them back together. Perhaps something like this:

(href=")(http://google\.com)?(/)?(.*)(")

Now you check every match, and put them back together if they are empty. [2] is the domain, [3] the slash, [4] the path. If the domain is always the same you could use a preg_replace.

echo preg_replace('%(href=")(http://google\.com)?(/)?(.*)(")%', 'href="http://google.com/$4"', $yourstring);

[joomphp]

any reference to understand this pattern '%(href=")(http://google\.com)?(/)?(.*)(")%', 'href="http://google.com/$4"' ?

[pritaeas]

http://www.regular-expressions.info/

You may want to try RegexBuddy or RegexMagic.