A small thing about vi regex

Well i was trying to remove all the spaces in the lines that are present before text.

So i thought to use vi's command mode and run

:%s/^\s+//

But this doesnt work ,then i found out (http://www.geocities.com/volontir/) that in vi the way to specify the '+' quantifier is to use,
'\+'.So it turns out the way to do it is .

:%s/^\s\+//

Also '?' quantifier is '\='.