$re = '/"uf":"([^"]+)(?!.*dating[1,2])/m';
$str = '[{"ads":[{"uf":"https://prhzxq.com/wnclcm?aid=2906583808848052910&t=1659642044&s=776108&mid=0","ttl":"Sarah (31) 1 km from you","n":"Hey, do you want to come? 😉😘","gf":"","ic":"https://i.wmgtr.com/cic/Ff89Uqu0t0q-Ic97IVjQaovVMiroHWrm.png","tn":""}],"rinfo":{"rw":"/wnrw?aid=2906583808848052910","rc":""}},{"ads":[{"uf":"https://prhzxq.com/wnclcm?aid=2906583808848052910&t=1659642044&s=770131&mid=1","ttl":"Brittany (30) 3 km from you","n":"Hey, do you want to come? 😉😘","gf":"","ic":"https://i.wmgtr.com/cic/h41dZhp8C7mIiHIIdXGZ9gSAZ1ZQjD0T.png","tn":"dating2"}],"rinfo":{"rw":"","rc":""}}]';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php