making preg_replace not working inside html

I am struggling.. I use this simple code for searching words in text开发者_如何学C and add relevant texts:

$search=array("/\bword1\b/","/\bword2\b/","/\bword3\b/");
$replace=array("<a href='link1'>word1</a>",ecc);
preg_replace($search,$replace,$myText);

Problem comes when one of the search pattern is found between a html inside $myText. Example:

$myText="blablablabla <strong class="word1">sad</strong>";

As you can see word1 is a css class for the link. If i run the preg_replace will destroy every markup there.

How can I edit my $search pattern for not matching inside html, something like: [^<.?*>] ?

Thanks

The simple-minded workaround is:

preg_replace("# [>][^<]*? \K \b(word1)\b #x", $replace, $txt);

This ensures that there's one closing > angle bracket before the word. (And \K makes it forget that matched part). However it will only ever replace the very first occurence of word1 per enclosing tag / paragraph / etc.

So a much better solution would be to use preg_replace_callback("/>([^<]+)/") and the second word1|word2|word3 regex (your existing code) in the callback function instead.