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I would like to use substitution in Vim to do unindentation manually (instead of doing <)
So I do this:
:%s/^(^I)?//g
but it does not find the pattern. what am i doing wrong?
Vim does not understand the Perl-ish regexp syntax that you seem to use. It must be:
The
(...)is not necessary, and must be written as\(...\). Instead of\t, you could also press Ctrl + V Tab, or use the general atom for whitespace\s.