1 Tests for multi-line regexps with ":s". vim: set ft=vim :
4 :" test if replacing a line break works with a back reference
5 :/^1/,/^2/s/\n\(.\)/ \1/
6 :" test if inserting a line break works with a back reference
7 :/^3/,/^4/s/\(.\)$/\r\1/
8 :" test if replacing a line break with another line break works
9 :/^5/,/^6/s/\(\_d\{3}\)/x\1x/