str_replace() и замена произвольного числа знаков, как? - Joomla 3.x: Общие вопросы

<tr><td>XXX</td><td><a>

<tr class="myclass"><td>XXX</td><td><a>

const str = '<tr><td>123</td><td><a>', regex = /<tr>(<td>\d+?<\/td><td><a>)/;
console.log(str.replace(regex, '<tr class="myclass">$1'));

<?php
$str = '<tr><td>123</td><td><a>';
echo preg_replace('#<tr>(<td>\d+?</td><td><a>)#', '<tr class="myclass">$1', $str);

const str = 'blahblahblah<tr><td>123.</td><td><a>blahblahblah', regex = /<tr>(<td>\d+\.?<\/td><td><a>)/;
console.log(str.replace(regex, '<tr class="myclass">$1'));

$str = 'blahblahblah<tr><td>123.</td><td><a>blahblahblah';
echo preg_replace('#<tr>(<td>\d+\.?</td><td><a>)#', '<tr class="myclass">$1', $str);