vimgrep - grep inside of vim

:grep
To use grep and regex inside vim.

As the doc say:

Vim has two ways to find matches for a pattern: Internal and external.
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In a nutshell, :vimgrep uses Vim's grep mechanism to read and find in files. :grep uses an external commands to achieve the same job.

The / search is for the current buffer only, whereas :[vim]grep search through a pattern of files, allowing you to search in an entire project at once.

Have a look at :h grep for more information.

/<word_to_search> search FORWADS for a pattern

?<word_to_search> search BACKWARDS for a pattern

n Search in same direction

N Search in opposite direction

In Vim, you can find and replace text using the :substitute (:s) command.

:[range]s/{pattern}/{string}/[flags] [count]
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The command searches each line in [range] for a {pattern}, and replaces it with a {string}. [count] is a positive integer that multiplies the command.

For example, to search for the first occurrence of the string ‘foo’ in the current line and replace it with ‘bar’, you would use:

:s/foo/bar/
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To replace all occurrences of the search pattern in the current line, add the g flag:

:s/foo/bar/g
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To confirm each substitution, use the c flag:

:s/foo/bar/gc
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replace with bar (y/n/a/q/l/^E/^Y)?
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You can also use regular expressions as a search pattern. The command bellow replaces all lines starting with ‘foo’ with ‘Vim is the best’:

:%s/^foo.*/Vim is the best/gc
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The ^ (caret) symbol matches the beginning of a line and .* matches any number of any characters.