I somehow can't get this to work: I have a simple string, for example:
<p>Foo & Bar</p> // <-- this should still be &
<a href="http://test.com/?php=true&test=test&p=p"> // <- This string should only be affected and be changed to &
<div> Yes ü No</div> // <-- This should still be ü
<a href="http://mycoolpage.com/?page=1&fun=true&foo=bar&yes=no">
Now I want to replace all the &
with only &
with preg_replace
and I tried to create a regex for this, but somehow I can't get it to work.
This is how far I've come, it finds only the last &
and also matches the whole string before it and fails to find the other. What am I doing wrong?
(?>=href\\=\\").*?(&)(?=\\")
Edit: It is not possible to use htmlentities_decode or htmlspecialchars_decode, as there is other Code that would get affected.
The natural way I see without knowing in depth the PHP regex API is to match the string against the pattern until there are no more matches, eg when the last &
is replaced, there will be no more matches
$str = "<p>Foo & Bar</p> // <-- this should still be &
<a href=\"http://mycoolpage.com/?page=1&fun=true&foo=bar&yes=no\">";
$pattern = "/(href=\".*?)(&)(.*?\">)/";
while (preg_match_all($pattern, $str, $matches)) {
$left = $matches[1][0]; // e.g. href="http://....?page=1
$before = substr($str, 0, strpos($str, $left)); // <p>Foo & ....
$index = strlen($before) + strlen($left);
$str = substr_replace($str, "&", $index, strlen("&"));
}
var_dump($str);
result:
<p>Foo & Bar</p> // <-- this should still be & <a href="http://mycoolpage.com/?page=1&fun=true&foo=bar&yes=no">
This comment by Wiktor Stribiżew has worked:
Or a harder way: http://ideone.com/ADku3b
<?php
$s = '<a href="http://myurl.com/?page=1&fun=true&foo=bar&yes=no">';
echo preg_replace_callback('~(<a\b[^>]*href=)(([\'"]).*?\3|\S+)([^>]*>)~', function ($m) {
return $m[1] . html_entity_decode($m[2]) . $m[4];
}, $s);
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