Allow space pregmatch

I have a preg match that allows valid characters, but how can allow middle spaces? Like for example University Of Insertname. Thanks.

preg_match("#^[A-Za-z']*$#",trim($schoolname)))

preg_match("#^[A-Za-z' ]*$#",trim($schoolname)))
Or, if you want to include "any whitespace character" such as line feed, etc.:
preg_match("#^[A-Za-z'\s]*$#",trim($schoolname)))

Thanks for the answer this helps. :)