UTF-8 search strange situation

Hi all

I have a very strange situation here...

I try to make a string search for a term in utf-8. My search term is "Den lille fløyten"

if i use this code:

$string = "Den Lille Fløyten"; // The string to search
$phrase = "Den lille fløyten"; // The term to search
$phrase = preg_replace('/\s+/', '\s+', preg_quote($phrase));
$p = '/\b' . $phrase . '\b/ui';
$result = preg_match($p, $string); // This gives me true (1)

everything is OK!

$SearchTerms=array('Høstnatt på Fjellskogen', 'Langt Innpå Skoga', 'Den lille fløyten', 'Sølv'); // my array with search terms
$string = "Den Lille Fløyten"; // The string to search
$phrase = $SearchTerms[2] // The term to search as part of an array
$phrase = preg_replace('/\s+/', '\s+', preg_quote($phrase));
$p = '/\b' . $phrase . '\b/ui';
$result = preg_match($p, $string); // This gives me FALSE (0)!!!!!!!