MyBB Community Forums

I have set up a profile custom field . now I want to know how to validate it?
i.e it is a field that only contains numbers but some funky members (over smart members)are inserting alphabets , special charters in it, and do spam on my form by registration. I want to validate the field i.e it only accepts numbers

You will need a plugin for this.

and where is the plugin? can u give me the link?

As far as I know, it doesn't exist. You can place a request in the Requests forum though:

http://community.mybb.com/forum-65.html

thats very basic, ok i m posting there