Coded on Windows, Not working on Linux - php

Question

I'm having issues with my code on Linux, It works fine on Windows which is running PHP 7.1 and Linux is running PHP 7.0. Looking at my code it doesn't look like I am using any of the features that came in 7.1 and are not in 7.0.
If I call this method on its own it works fine, When it is used within my other code it doesn't seem to run at all.
public function titleRegex($title){
$re = "/^.+?(?=\\s*[(.]?(\\d{4}))/mi";
$str = "$title";
if(preg_match_all($re, $str, $matches) != null) {
if (!empty($matches[0])) {
$arrayString = implode('', $matches[0]);
return $arrayString;
}
}
return $title;
}
$title = pathinfo($name, PATHINFO_FILENAME);
$regexTitle = $this->titleRegex($title);
$imdbQuery = $this->imdbScraper($regexTitle);
$location = base64_encode(pathinfo($name, PATHINFO_DIRNAME));
// SQL Data is here
When I run the directoryscanner it attempts no regex, If I call the regex method on its own and pass my own values into it, It works fine. Also I have installed PHP7.0-curl and when I do a curl request on all the movie titles it returns nothing... but if I call the method on its own it works fine. I am totally lost what could be causing this.