regex to parse html code

[nasser bahaj]

hi all

 

I am developing a code can put links at some words .

 

the code look like this :

$html='
<b> download firefox program now from this link <a href="http://www.download8.com/firefox">download firefox program now</a><b><br>';
echo $html;
$words2=array("firefox","program");
$links2=array("http://www.firefox.com","http://www.soft.com");
for ($i=0;$i<count($words2);$i++){
$words[]="/  ".$words2[$i]."  /i";
$links[]=" <a href='$links2[$i]' style='color:red;'>$words2[$i]</a> ";
}
$count=5;
$html=preg_replace($words,$links,$html,$count);
echo $html;

 

now ,

 

this code is working well but if one of words ("firefox","program") already inside link this will damage the original link because it put link inside link .

 

for example this html code

$html='
<b> download firefox program now from this link <a href="http://www.download8.com/firefox">download firefox program now</a><b><br>';

 

I want to put this url "http://www.firefox.com" on "firefox" word but I want first to check if this word are already link (already inside <a></a> tags) , to avoid damage of existing links in the code .

 

I hope your help please

 

thank you .

[cags]

Based on your current code you could use a simple negative look behind assertion to check if the word isn't preceded by www. or http://, note I also encased used the \b escape sequence to ensure it only matches at word end so that 'programmer' wouldn't match.

 

#(?<!www\.|http://)\b{$word}\b#'

 

Of course I based this off of your code, which doesn't actually use anchor links, the solution would need to be different in a more complex system.

[nasser bahaj]

thank you mr cags for your reply

 

problem still unsolved

 

for more clear example

 

this code

 

$html='
<b> download firefox program now from this link <a href="http://www.download8.com/firefox">download firefox program now</a><b><br>';

 

now we have "firefox" word three times in code

 

I want to put these words into anchor link "<a href='http://www.firefox.com'>firefox</a>" but  I dont want put all "firefox" words into anchor link because some words already inside anchor link  like this "a href="http://www.download8.com/firefox">download firefox program now</a>" if I put link on this word it will destroy the existing link .

 

then the solve of this problem that is to replace words by links if the word not already inside anchor link.

 

thanks

 

[cags]

As I already said in my previous post, if it was more complex a more complex solution would be required. Perhaps something like this would be more appropriate...

 

'#\bfirefox\b(?![^<]*>|[^<]*</a)#'

 

 

[nasser bahaj]

thank you very much dear cags

 

very great

 

problem solved

 

best regards.