* vim and regex cheatsheet

** Search and Replace

See also [[https://vim.fandom.com/wiki/Search_and_replace][this fandom vim wiki page]].

*** Basic:

- =:s/find/replace/=, only search in current line, and replace the first matched pattern

*** Search in a certain range

- Default: only in current line
- In all lines: =:%s/f/r/=
- In selected *line*: =:'<,'>s/f/r/=
- In selected *characters*: =:`<,`>s/f/r/=

*** Repeat

- Default: only first matched in given range
- match every one: =:s/f/r/g=

*** Other

- *Reuse* the matched pattern:

  1. =:s/f/&/=

     =&= is the text that matches the search pattern.

     Example: =:s/[a-z]/&1/g=, add a =1= after each characte
  2. =:s/\(a\)/\1/=

     =\(a\)= makes a backreference to =a=.

     =\1= is the first backreference,
     =\2= is the second backreference,
     =\0= is the text matched by the entire pattern.