Will this help combat registration bots?
 

I'm thinking of requiring a first and last name for registration to help combat registration bots.

Will this force registrants to enter a first and last name by specifying this in the vBulletin Options > vBulletin Options > User Registration Options > Username Regular Expression:

Code:
^[a-zA-Z'-]+\s+([a-zA-Z'-]+\s*)+
...or will this only help in search modes?

I'm looking for a way to force registrants to use at least two words for a username as a means of cutting down on reg bots registrations.

Will the above expression do the trick?