How to apply regular expressions to unicode characters?

[SneakyDave]

I have a regular expression that replaces characters and numbers in a string. I use preg_replace and a regular expression of "/[a-z\d]/i" to do that.

$newtext= preg_replace("/[a-z\d]/i", "x", $originaltext);

Is there an easy way to extend that regex to include unicode characters?

Edited to add, after a bit of searching, could I reaplce [a-z] with this to include "any kind of letter from any language"?

$newtext= preg_replace("/[\p{L}\d]/i", "x", $originaltext);

 

[Chris D]

I think you can just use the /u modifier and that will include unicode characters amongst the normal [a-z] range.

$newtext = preg_replace("/[a-z\d]/iu", "x", $originaltext);

 

[SneakyDave]

I didn't even realize that flag existed, I'll try it out, thanks Chris.

 

[SneakyDave]

It looks like, for my situation anyway, my edited regex above works, catching all of these characters:
https://regex101.com/r/MGtqLW/2

I'm not sure why Chris' example doesn't catch the Armenian characters below, but looks like a great opportunity for me to learn more about the hated regular expression syntax:
https://regex101.com/r/MGtqLW/1