vim匹配

本文简单梳理了 vim 搜索匹配模式，相关议题 :h pattern。

clear search highlighting

如何去掉当次搜索高亮？

highlight - Vim clear last search highlighting - Stack Overflow

After doing a search in Vim, I get all the occurrences highlighted. How can I disable that? I now do another search for something gibberish that can't be found. Is there a way to just temporarily disable the highlight and then re-enable it when needed again?

1. To turn off highlighting until the next search: :noh/:nohl/:nohls/:nohlsearch.
2. Or turn off highlighting completely: :set nohlsearch; type :set hlsearch to turn on again.
3. From the VIM Documentation，to clear the last used search pattern: :let @/ = ""

Clear Search Highlight in Vim — tech.serhatteker.com

I personally use 'temporarily disable' with key mapping. I mapped :noh to key. Since hitting is a very common and intuitive situtation in Vim.

" noh - no highlight
map <esc> :noh <CR>

Clear search highlight - VimTricks

incrementally highlights pattern

incsearch

incsearch.vim incrementally highlights ALL pattern matches unlike default 'incsearch'.

Search across multiple lines

Search across multiple lines

How to substitute text across line breaks?
How to do a multiline search in vim
How to search and delete literal text spanning multiple lines?

Multiline Search and Replace
Multi-line regex support in Vim

The search /^abcd finds abcd at the beginning of a line, and /abcd$ finds abcd at the end of a line.
However, in /abcd^efgh and /abcd$efgh the ^ and $ are just ordinary characters with no special meaning.
By contrast, each of the following has a special meaning anywhere in a search pattern.

meta	pattern
\n	a newline character (line ending)
\_s	a whitespace (space or tab) or newline character
\_^	the beginning of a line (zero width)
\_$	the end of a line (zero width)
\_.	any character including a newline

shortest match first

相关议题：:h non-greedy

vim下正则表达式的非贪婪匹配
VIM中正则的非贪婪匹配

执行 git merge origin/master 后，想删除本地 ours HEAD 部分，采用 theirs MERGE_HEAD：

首先查找所有 conflict 的 ours 部分：

/^<<<<<<< HEAD\_$\_.\{-}\_^=======\_$

替换为空行：

:%s/^<<<<<<< HEAD\_$\_.\{-}\_^=======\_$//gc

但这并不是我们想要的，空行还是非预期占位一行。

delete all patterns

Delete all lines containing a pattern

How to delete a multi-line match?
Efficient way to delete line containing certain text in vim with prompt

:g 可以删除 theirs 部分的单行结尾标记：

:g/^>>>>>>> origin\/master$/d

但是对于跨行匹配的结果，:g 只删除了第1行？

:g/^<<<<<<< HEAD\_$\_.\{-}\_^=======\_$/d

global 命令先扫描 [range] 界定的行，然后对每个匹配的行进行标记 (对于一个跨行的匹配，则只针对开始的一行)。

另一种方法：基于 gn 选中 search pattern 命中高亮部分（select text highlighted by search），再执行删除。

先执行查找：

/^<<<<<<< HEAD\_$\_.\{-}\_^=======\_$

再执行 gn$d，然后重复 gn$d。

gn 后如果不添加 $，执行删除后换行分隔符将占位一行。

参考 VIM提取/删除匹配行的方法，实现 KeepLines(pattern) 函数。

对于大型的文本处理，建议使用 sed/awk 命令。

其他方案

1. vscode 正则搜索
2. sed/awk

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