正則替換

Question

<div  class='t'></div>
<div  class='t'></div>
<div  class='t'></div>
<div  class='t'></div>我想用正则把最后一个‘t’换成a 要怎么换？

Answer 1

<?php
$input="
<div class='t'></div>
<div class='t'></div>
<div class='t'></div>
<div class='t'></div>
";$newString = preg_replace( "/<div.*'t'>/","<div class='a'>", $input);
echo $newString;
?>

Answer 2

$str = <<<EOD
<div class='t'></div>
<div class='t'></div>
<div class='t'></div>
<div class='t'></div>
EOD;
echo htmlspecialchars($str).'<br>';
echo htmlspecialchars(preg_replace("/t[^t]+?$/i", "a'></div>", $str));