preg_match with international characters and accents

问题

I would like to validate a string with a pattern that can only contain letters (including letters with accents). Here is the code I use and it always returns "nok". I don't know what I am doing wrong, can you help? thanks

$string = 'é';

if(preg_match( '/^[\p{L}]+$/i', $string))
{
    echo 'ok';
} else{
    echo 'nok';
}

回答1:

Add the UTF-8 modifier flag (u) to your expression:

/^\p{L}+$/ui

There is also no need to wrap \p{L} inside of a character class.

来源：https://stackoverflow.com/questions/11649019/preg-match-with-international-characters-and-accents