Vim search and replace summary

Summary of common replacement modes in vim.

0,: G/null/d

Locate the null row and delete it.

1. Simple replacement expression

The replacement command can replace another word with one word in the full text:

: % S/four/4/g

The prefix of "%" indicates that replacement is performed in all rows. The last "G" Mark replaces all matching points in the row. If you only operate on the current row, remove %.

If you have a word like "thirtyfour", the above command will fail. In this case, the word is replaced with "thirty4 ″. To solve this problem, use "/<" to specify the start of the matching word:

: % S // <four/4/g

Obviously, errors will still occur when processing "fourty. Use "/>" to solve this problem:

: % S // <four/>/4/g

If you are coding, you may just want to replace the "four" in the comment, but keep the "four" in the code. Since this is difficult to specify, you can add a "C" mark in the replacement command, so that Vim will prompt you before each replacement:

: % S // <four/>/4/GC

2. Delete unnecessary spaces.

To delete unnecessary spaces behind each line, run the following command:

: % S/+ $ //

The command specifies that the range is "%", so this will apply to the entire file ." The matching mode of the substitute command is

"/S/+ $ ". This indicates one or more (/+) spaces (/s) before the end of the line ($ ). The "to" part of the replacement command is empty :"//". In this way, the matching spaces are deleted.

3. Matching repetition Mode

The asterisk (*) specifies that the items before it can be repeated at any time. Therefore:

/*

Match "A", "AA", "AAA", and so on. But it also matches "" (Null String), because zero times are also included. The asterisk "*" is only applied to the item next to it. Therefore, "AB *" matches "A", "AB", "ABB", and "abbb. To repeat the entire string multiple times, the string must be an item. Add "/(" before it and add "/)" after it. Therefore, this command:

// (AB /)*

Matching: "AB", "Abab", "ababab", and so on. It also matches "".

To avoid matching null strings, use "/+ ". This indicates that the previous item can be matched once or multiple times.

/AB/+

Match "AB", "ABB", "abbb", and so on. It does not match "A" that follows "B ".

To match an option, use "/= ". For example:

/Folders/=

Matches "folder" and "Folders ".

4. specify the number of repetitions

To match a specific number of times of repetition, use the form "/{n, m. "N" and "m" are numbers. The item before it will be repeated "N" to "M" Times (| aggressive sive | contains "N" and "m "). For example:

/AB/{3, 5}

Match "abbb", "abbbb", and "abbbbb ".

When "N" is omitted, It is 0 by default. When M is omitted, It is infinitely large by default. When ", M" is omitted, it indicates that the repetition is exactly "N" times. For example:

Number of pattern matches

/{, 4} 0, 1, 2, 3, or 4

/{3,} 3, 4, 5, and so on

/{0, 1} 0 or 1, same as/=

/{0,} 0 or more, the same *

/{1,} 1 or more, same as/+

/{3} 3

5. Select one or more matches.

In a search mode, the "or" operator is "/| ". For example:

/Foo/| bar

This command matches "foo" or "bar ". More options can be connected to the following:

/One/| two/| three

Match "one", "two", or "three ".

To match multiple times, the entire decision structure must be placed between "/(" and:

// (FOO/| bar/)/+

This command matches "foo", "foobar", "foofoo", "barfoobar", and so on.

Another example:

/End/(if/| while/| /)

This command matches "endif", "endwhile", and "endfor ".