add u PCRE modifier to str::words.

laravel/str.php

@@ -150,7 +150,7 @@ class Str {
 	{
 		if (trim($value) == '') return '';
 
-		preg_match('/^\s*+(?:\S++\s*+){1,'.$words.'}/', $value, $matches);
+		preg_match('/^\s*+(?:\S++\s*+){1,'.$words.'}/u', $value, $matches);
 
 		if (static::length($value) == static::length($matches[0]))
 		{