hi i'm very new at programing. I dont know how to write a php regulat expression to add something between href=" and some text after it how to make this
<a class="aaa" href="/some/file.html">
to look like
<a class="aaa" href="http://www.example.com/some/file.html">
it is necessary to match links with "aaa" class.
Can anybody help me ?
You better don't even start trying to do this with regular expressions.
You should use a DOM parser for tasks like this. This one for example makes your life really easy.
$html = new simple_html_dom();
$html->load($input);
foreach($html->find('a[class=aaa]') as $link)
$link->href = "http://www.example.com".$link->href;
$result = $html->save();
find lets you query the DOM very nicely. The parameter is tagtype[attributeName=attributeValue] where the square brackets are an optional filter. Then you just iterate over every link this function finds, and prepend the href attribute with your domain.
If you cannot use 3rd-party libraries for some reason, PHP comes with a built-in DOM module. The code will not be quite as short and elegant, but it is still highly preferable to trying to come up with a robust regex.
include "simple_html_dom.php"; somewhere. then you rename the variable in your code below to $input and copy my code after that. by the way, you can find the example-div using simple_html_dom, too. no need for regex at allYou could do it this way:
$string = '<a class="aaa" href="/some/file.html">';
$pattern = '~class="aaa" href="(.*)"~isU';
preg_match($pattern, $string, $matches);
$string = str_replace($matches[1],"http://www.example.com".$matches[1],$string);
echo $string;
Edited to match class="aaa" but I'd also recommend m.buettners way if you're doing things like that a lot.
aaa). plus, there is no need to match and capture anything after href="