Swapping words with pure Regex-CodePudding

I'd like to swap two words using capture groups in Vim using only one line of regex, but I cannot find a solution to this for example

word1
word2

expecting:
word2
word1

get:
word1
word2

I've also tried s/(word1)(word2)/\2\1/g but they don't swap their position or even replace

Is there any way I can achieve this?

CodePudding user response：

You are not matching the newline in between, and the newline is also not present in the replacement.

For the capture groups you can escape the parenthesis:

\(word1\)\n\(word2\)/\2\r\1/

Output

word2
word1

If you want to replace all occurrences and not have to escape the parenthesis you can use the very magic mode using \v and use %s

%s/\v(word1)\n(word2)/\2\r\1/g

If the word can be spread, you can match any character non greedy in between and also use a capture group for that in the replacement.

%s/\v(word1)(\_.{-})(word2)/\3\2\1/g

See this page for extensive documentation.

CodePudding user response：

I am all for designing under hard constraints but pragmatism has value, too. What good is it to wait for someone else to write you a super fancy one-liner when you can write three super simple commands on the spot?

:%s/word1/§§§§/g
:%s/word2/word1/g
:%s/§§§§/word2/g

If you really dig the mystique of one-liners:

:%s/word1/§§§§/g|%s/word2/word1/g|%s/§§§§/word2/g

CodePudding user response：

I doubt this exactly what you looking for, however Tim Pope's Abolish provides the :Subvert/:S command which can make swapping easy

:%S/{foo,bar}/{bar,foo}/gw

This will swap the following:

foo -> bar
bar -> foo

:Subvert takes similar flags to :s. I am using w for word-wise and g for global