php regex word boundary matching in utf-8

Question

I have the following php code in a utf-8 php file:

var_dump(setlocale(LC_CTYPE, \'de_DE.utf8\', \'German_Germany.utf-8\', \'de_DE\', \'german\'));
var_dump(m         


        

Answer 1

here is what I have found so far. By rewriting the search and replacement patterns like this:

$before = '(^|[^\p{L}])';
$after = '([^\p{L}]|$)';
var_dump(preg_replace('/'.$before.'weiß'.$after.'/iu', '$1weiss$2', 'weißbier'));
// Test some other cases:
var_dump(preg_replace('/'.$before.'weiß'.$after.'/iu', '$1weiss$2', 'weiß'));
var_dump(preg_replace('/'.$before.'weiß'.$after.'/iu', '$1weiss$2', 'weiß bier'));
var_dump(preg_replace('/'.$before.'weiß'.$after.'/iu', '$1weiss$2', ' weiß'));

I get the wanted result:

string 'weißbier' (length=9)
string 'weiss' (length=5)
string 'weiss bier' (length=10)
string ' weiss' (length=6)

on both my windows computer running apache and on the hosted linux webserver running apache.

I assume there is some better way to do this.

Also, I still would like to setlocale my windows computer to utf-8.