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cli: add engine flag

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This permits switching between the different regex engine modes that
ripgrep supports. The purpose of this flag is to make it easier to
extend ripgrep with additional regex engines.

Closes #1488, Closes #1502
This commit is contained in:
pierrenn
2020-02-28 00:58:56 +09:00
committed by Andrew Gallant
parent aab3d80374
commit 3a6a24a52a
5 changed files with 68 additions and 6 deletions
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README.md
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@@ -109,7 +109,8 @@ increases the times to `2.640s` for ripgrep and `10.277s` for GNU grep.
Among other things, this makes it possible to use look-around and
backreferences in your patterns, which are not supported in ripgrep's default
regex engine. PCRE2 support can be enabled with `-P/--pcre2` (use PCRE2
always) or `--auto-hybrid-regex` (use PCRE2 only if needed).
always) or `--auto-hybrid-regex` (use PCRE2 only if needed). An alternative
syntax is provided via the `--engine (default|pcre2|auto-hybrid)` option.
* ripgrep supports searching files in text encodings other than UTF-8, such
as UTF-16, latin-1, GBK, EUC-JP, Shift_JIS and more. (Some support for
automatically detecting UTF-16 is provided. Other text encodings must be