Per comments, it’s best to use single quoted strings for regexs in PHP (then only backslash and single quote are special), and only backslash as necessary, eg in this case
$url_regex = '/href="https://wordpress.stackexchange.com/questions/219419/(http"https):\/\/.+?"https://wordpress.stackexchange.com/";
(leaving out the positive lookahead which isn’t needed here).
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