Regular Expression - Allow White Spaces

I have an asp.net control using a regular expression for validation, it is for an email address.  It allows alphanumeric and also allows 1 character domain names.  

I need to modify it to also allow white spaces at the beginning and end of it (but not anywhere in the middle).  Not sure how to do this, I have tried and have failed miserably thus far.  

Here is the current expression which works as desired but new request for white spaces means it needs to be updated:

Public Const REG_EMAIL As String = "^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$"

Thanks in advance, I hope someone can help.