Regular expression generator

[doktornotor]

When you are just about to start pulling your hair out…

https://txt2re.com/index-php.php3

[jimp]

I also like: https://regex101.com/

[NOYB]

My favorite is: http://php.net/manual/en/pcre.pattern.php

Along with:

$regex_sub_pattern_x = "something_x";
$regex_sub_pattern_y = "something_y";
$regex_sub_pattern_z = "something_z";

$regex_pattern = $sub_pattern_x . $sub_pattern_y . $sub_pattern_z;