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doc: clarify capture group indices

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And in particular, note the special $0 index, which corresponds to the
entire match.

Fixes #1591
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Andrew Gallant 2020-05-21 22:22:51 -04:00
parent b72ad8f8aa
commit a700b75843
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CHANGELOG.md
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@ -6,6 +6,8 @@ Bug fixes:
* [BUG #1581](https://github.com/BurntSushi/ripgrep/issues/1581): * [BUG #1581](https://github.com/BurntSushi/ripgrep/issues/1581):
Corrects some egregious markup output in `--help`. Corrects some egregious markup output in `--help`.
* [BUG #1591](https://github.com/BurntSushi/ripgrep/issues/1591):
Mention the special `$0` capture group in docs for the `-r/--replace` flag.
12.1.0 (2020-05-09) 12.1.0 (2020-05-09)

11
crates/core/app.rs
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@ -2576,10 +2576,13 @@ Replace every match with the text given when printing results. Neither this
flag nor any other ripgrep flag will modify your files. flag nor any other ripgrep flag will modify your files.
Capture group indices (e.g., $5) and names (e.g., $foo) are supported in the Capture group indices (e.g., $5) and names (e.g., $foo) are supported in the
replacement string. In shells such as Bash and zsh, you should wrap the replacement string. Capture group indices are numbered based on the position of
pattern in single quotes instead of double quotes. Otherwise, capture group the opening paranthesis of the group, where the leftmost such group is $1. The
indices will be replaced by expanded shell variables which will most likely special $0 group corresponds to the entire match.
be empty.
In shells such as Bash and zsh, you should wrap the pattern in single quotes
instead of double quotes. Otherwise, capture group indices will be replaced by
expanded shell variables which will most likely be empty.
To write a literal '$', use '$$'. To write a literal '$', use '$$'.