<a href="http://www.example.com/foo/bar/" title="foo">
<img src="http://www.example.com/foo/bar/" alt="foo" />
</a>
How can I preg_replace the word foo only in the href attribute?
NOTE: There are multiple links on the page.
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1 Answer
You could do this:
$str = preg_replace('/(href="[^"]*)foo/', '$1replacement', $str);
Alternatively, you could use a lookbehind:
$str = preg_replace('/(?<=href="[^"]*)foo/', 'replacement', $str);
Note that this will only work if there are no '-delimited attributes and no escaped " within your attributes.
This is why you should really consider to use a DOM parser, instead of manipulating HTML with regular expressions.
Update: Here is a proper implementation using a parser (I just picked PHP Simple HTML DOM Parser, because it was the first one showing up on Google):
require "simple_html_dom.php";
$html = file_get_html($filename);
foreach($html->find('a') as $element)
{
$element->href = preg_replace('/foo/', 'replacement', $element->href);
}
Now echoing $html or saving it to a file, will contain the correctly replaced HTML. (Using a DOM parser can be so easy.) ;)
4 Comments
John Dvorak
or, better yet, generating the correct HTML from the very start.
Martin Ender
Well who says, the OP is generating it?
John Dvorak
any other plausible use-case of transforming an HTML into HTML?
Martin Ender
I usually try not to second-guess all possible uses someone might have in mind for a particular question ^^
