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I created an example of text:

dog cat worm

And I want to replace everything but not the first word and without knowing what's there.

At first I tried this::%s/\(dog\)\(.*\)/\1/g

This works fine but when I change it to: :%s/\(\w\)\(.*\)/\1/g

it returns

d

For second word regexp :%s/.*\(cat\)\(.*\)/\1/g I get cat so it's just as I wanted but with :%s/\w\(\w\)\(.*\)/\1/g I get c

3

\w does not represent a word but merely a word-character.

You want :%s/\(\w\+\)\(.*\)/\1/g

Also, in this simple example the /g does nothing though

  • Ok it works for the first example but second one: :%s/\(\w\+\)\(\w\+\)\(.*\)/\2/ returns g from dog word. Anyway is there a way of not escaping all characters like +)(? Regex gets messy really quick because of this. – A. Dziedziczak Jun 21 '17 at 10:37
  • Ok I figured it out: :%s/\(\w\+\)\s\(\w\+\)\(.*\)/\2/ The problem was with space character. As my regexp cover full line I needed to add space character as it separates words. Thanks for help! – A. Dziedziczak Jun 21 '17 at 12:51
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    @A.Dziedziczak If you don't want to have to escape so many characters, use a "very magic" pattern. See :help /\v – Rich Jun 21 '17 at 15:47

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