Perl compatible regular expressions

Tip 393 Printable Monobook Previous Next

created 2002 · complexity intermediate · version 6.0

1. Verify with :ver that +perl or +perl/dyn is compiled in.

2. Install Perl if necessary. On Windows, ActivePerl is standard but any dependency-free perl58.dll will work if you don't need any other perl modules. If you don't want a full install of perl, copy perl58.dll from Strawberry Perl 5.8.x into the folder vim.exe lives and the commands below will work.

3. Type :perldo s/searchme/replaceme/g

Note: +perl/dyn doesn't seem to be necessary.

Comments[]

Or if you have ruby compiled in (look for +ruby in :ver output), you can use the following:

Equivalent to s/pattern/replacement/g

:rubydo gsub /pattern/,'replacement'

Equivalent to s/pattern/replacement/

:rubydo sub! /pattern/,'replacement'

The advantage of this tip is that when you know Perl regex well it's easier to write Perl regex than vi regex. Either is fine for simple expressions, but when the expressions get more complex its much easier to work with the syntax you know the best.

Perl regexes also have a different set of "special characters".

For example, the parentheses () are special characters that automatically do grouping and capturing in perl. In a vi regex, they need to be escaped (\( \)) before they'll turn special.

Keep in mind that :perldo is not always enough. Just try to replace something with a newline (:perldo s/<text>/\n/<ENTER>). I get ^@ character instead of a line break. Yeah, I asked for it, but it's not what I wanted.

Maybe it works to let Perl parse the \n instead of Vim? I don't have Perl support in my Vim, but maybe using \\n instead of \n might work. --Fritzophrenic (talk) 15:35, August 7, 2013 (UTC)

In this particular case, just use the old "perl pie":

:%!perl -pi -e 's/<text>/\n/'

For whatever reason (in my vim), I need to use "double quotes" instead of "single quotes" like this for substituting (hope this helps someone):

:%!perl -pi -e "s/<text>/\n/"

This command relies on your shell to run Perl. So if your shell doesn't support single quotes it won't work. Windows in particular does NOT support single quotes in its default shell (cmd.exe). --Fritzophrenic (talk) 15:35, August 7, 2013 (UTC)

The inplace (i) is a no-op in this case, so just use

:%!perl -pe 's/a/b/'

--~~~~

VimTip6

Script to search using PCRE in Vim: http://groups.yahoo.com/group/vim/message/49561

I know this is a small thing, but you might check out "\v", aka very-magic as a way to make the regular expressions less annoying and more perl-like. It would be nice if I could put set very-magic in my vimrc.

You can also define new command like this:

function s:Substitute(sstring, line1, line2)
  execute a:line1.",".a:line2."!perl -pi -e 'use encoding \"utf8\"; s'".
        \escape(shellescape(a:sstring), '%!').
        \" 2>/dev/null"
endfunction
command -range=% -nargs=+ S call s:Substitute(<q-args>, <line1>, <line2>)
" Example usage:
S(<regex>)[<replacement>]<flags>

"<q-args>" produces an escaped and enclosed in double quotes string, problems with unicode are solved (I hope so) by "use encoding" statement.

I found the above did not work for me, and played around with it until I got something working (2018):

A way to call perl directly for substitution[]

" Use local perl to handle substitution
" Invoke via :S/pattern/replace/flags
function s:Substitute(line1, line2, sstring)
  let l:lines=getline(a:line1, a:line2)
  " Call perl using utf8.  #line etc makes error messages prettier
  let l:sysresult=system("perl -e 'use utf8;' -e '#line 1 \"perl substitution\"' -pe ".
        \shellescape("s".escape(a:sstring,"%!").";"), l:lines)
  if v:shell_error
    echo l:sysresult
    return
  endif
  let l:result=split(l:sysresult, "\n", 1)  " 1: don't drop blank lines
  " delete lines but don't put in register:
  execute a:line1.",".a:line2." normal \"_dd"
  call append(a:line1-1, l:result)  " add lines
  call cursor(a:line1, 1)  " back to starting place
  if a:line1 == a:line2
    echom "Substitution on line" a:line1
  else
    echom "Substitution on lines" a:line1 "to" a:line2
  endif
endfunction

command -range -nargs=1 S call s:Substitute(<line1>, <line2>, <q-args>)

Hope that helps someone else, and thanks for the earlier function I used to build this! (I could only test on linux, btw) --Peter Kay

The way to do this is with a filter :help !. Use filter commands to process text#Simple filter example has an example. JohnBeckett (talk) 07:39, January 19, 2018 (UTC)

eregex.vim[]

There is a plugin eregex.vim doing the notation translate, from the Vim regex notation to perl/ruby stylish regex notation. However the document is written in Japanese. So I translate some content to explain how to use it.

Install

Vimball file. Open it with Vim and execute :so % .

Quick start

Add the following code to .vimrc file.

nnoremap / :M/
nnoremap ,/ /

Now you can use / to find. :%S// (uppercase S) to replace.

Original Version of eregex.vim is produced by a Japanese.

Perl compatible regular expressions

Comments[]

A way to call perl directly for substitution[]

eregex.vim[]

Fan Feed