hyphen need to be escaped

[ldbglobe]

Prevent some warning since PHP 7.3

[ShawnMcCool]

Is there a reason that this hasn't been merged, @danielstjules ?

This instantly fixes an important problem that I have where I cannot use Slugify.

[droath]

Is there any chance on getting this issue resolved? I've provided information about what has changed in 7.3 that is causing this error to be thrown.

https://stackoverflow.com/questions/24764212/preg-match-compilation-failed-invalid-range-in-character-class-at-offset