PHP regex Word Boundaries doesnt match end of string

Question

i want to find an exact word has been a string. but if its end of the string, word boundaries failing. i thought because of special turkish chars but second code works expected. where is my mistake?

this code returns 0

$row = "TEDARİKÇİ,MÜŞTERİ";
var_dump( preg_match('#\bMÜŞTERİ\b#iu', $row));

but this one returns 1

$row = "TEDARİKÇİ,MÜŞTERİ";
var_dump( preg_match('#\bMÜŞTERİ$#iu', $row));

Answer 1

I though both regex should work but I got same problem as you in regex101. So, in order to fix this you can change your regex to:

$row = "TEDARİKÇİ,MÜŞTERİ";
var_dump( preg_match('#\bMÜŞTERİ(\b|$)#iu', $row));

Working demo