[Malleys]

PHPЗапустить

<?php
$string = "Ab1 @any_text.text https://instagram.com/anylink";

if(preg_match('/^\s*Ab1\s+@[\w.]+\s+(?:https?\:\/\/|)instagram\.com\/[^\s]+\s*$/m', $string)) {
    echo 'ok';
}

JS

var string = "Ab1 @any_text.text https://instagram.com/anylink";

if(/^\s*Ab1\s+@[\w.]+\s+(?:https?\:\/\/|)instagram\.com\/[^\s]+\s*$/m.test(string)) {
    alert("ok");
}