Matching Unicode letter characters in PCRE/PHP

Question

I\'m trying to write a reasonably permissive validator for names in PHP, and my first attempt consists of the following pattern:

// unicode letters, apostrop         


        

Answer 1

Anyone else looking here and not getting this to work, please note that /u will not produce consistent result with Unicode scripts across different PHP versions.

See example: https://3v4l.org/4hB9e

Related: Incosistent regex result for Thai characters across different PHP version