PHP and regexp to accept only Greek characters in form

Question

I need a regular expression that accepts only Greek chars and spaces for a name field in my form (PHP). I\'ve tried several findings on the net but no luck. Any help will be

Answer 1

Greek & Coptic in utf-8 seem to be in the U+0370 - U+03FF range. Be aware: a space, a -, a . etc. are not....