- print_r: documentation ( source)
- preg_match_all: documentation ( source)
<?php
$re = '~https:(?://|(?:\\\\u002F){2})site\.vid\.com(?:/|\\\\u002F)[^"]*~';
$str = 'https:\\u002F\\u002Fsite.vid.com\\u002F93836af7-f465-4d2c-9feb-9d8128827d85\\u002F6njx6dp3gi.m3u8?token=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJjb3VudHJ5IjoiSU4iLCJkZXZpY2VfaWQiOiI1NjYxZTY3Zi0yYWE3LTQ1MjUtOGYwYy01ODkwNGQyMjc3ZmYiLCJleHAiOjE2MTA3MjgzNjEsInBsYXRmb3JtIjoiV0VCIiwidXNlcl9pZCI6MH0.c3Xhi58DnxBhy-_I5yC2XMGSWU3UUkz5YgeVL1buHYc","';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
print_r($matches[0]);