Text box validation using regular expressions

I have a textbox and have to use the regular expressions in asp.net


my text should not allow the spaces in first and last place.

output should be:
-----------------

India Bangalore -valid

<space>India Bangalore<space> - not valid

i.e : use can enter the spaces in between the words but not in first position and last position.


If you have solution in java script that also fine.

Thanks in advance.