Exact string match in vim? (Like 'regex-off' mode in less.)

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悲&欢浪女
悲&欢浪女 2020-12-09 07:49

In vim, I often want to search on a string with finicky characters which need escaping. Is there a way I can turn off the meaning of all special characters, kind of

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  • 2020-12-09 08:01

    Depending on the exact string you're searching, the \V prefix will probably do the trick.
    See :help \V:

    after:    \v       \m       \M       \V         matches ~
                    'magic' 'nomagic'    
              $        $        $        \$         matches end-of-line
              .        .        \.       \.         matches any character
              *        *        \*       \*         any number of the previous atom
              ()       \(\)     \(\)     \(\)       grouping into an atom
              |        \|       \|       \|         separating alternatives
              \a       \a       \a       \a         alphabetic character
              \\       \\       \\       \\         literal backslash
              \.       \.       .        .          literal dot
              \{       {        {        {          literal '{'
              a        a        a        a          literal 'a'
    

    So if I have a string hello.*$world, I can use the command /\V.*$ to find just .*$ -- the only part of the string that should need escaping is another backslash, but you can still do grouping, etc., by escaping the special symbol.


    Another command you can use to "avoid" forward slashes is:

    :g #\V((N/N)/(N/N))/N#   
    

    The :g command is a global search, noting that:

    :[range]g[lobal]/{pattern}/[cmd]
                            Execute the Ex command [cmd] (default ":p") on the
                            lines within [range] where {pattern} matches.
    
    Instead of the '/' which surrounds the {pattern}, you can use any other
    single byte character, but not an alphanumeric character, '\', '"' or '|'.
    This is useful if you want to include a '/' in the search pattern or
    replacement string.
    

    So where I used a #, you could use a ?, @, or whatever other character meeting the above condition. The catch with that :g command is that it expects a command at the end, so if you do not have a trailing space after the final character, it won't perform the search as you would expect. And again, even though you're using \V, you'll still have to escape backslashes.

    If that still doesn't cut it for you, this Nabble post has a suggestion that takes a literal string with embedded backslashes and other special Vim characters, and claims to search for it without a problem; but it requires creating a Vim function, which may or may not be okay in your environment.

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  • 2020-12-09 08:20

    Maybe something like this:

    nmap <Leader>s :execute '/\V' . escape(input('/'), '\\/')<CR>
    

    It'll give you a / prompt and behave otherwise like the built-in search, but it won't do search-as-you-type or other such goodies.

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  • 2020-12-09 08:22

    Looking at your specific example, probably the easiest way to do this (since \V won't help here) is to use ? instead of /: then you won't have to escape the /s:

    ?((N/N)/(N/N))/N
    

    This will search backwards instead of forwards, but you can always do 'N' instead of 'n' to search forwards after the first go. Or you can press / followed by the up cursor key to automatically escape the forward slashes.

    However, there's nothing you can easily do about escaping backslashes. I guess you could do:

    :let @/ = escape(pattern, '\')
    

    and then use n to search, but it's probably not much easier. The best I can come up with is:

    :command! -nargs=1 S let @/ = escape('<args>', '\')
    

    Then do:

    :S (N)/(N+1)\(N)
    n
    
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