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doc: improve PCRE2 failure mode documentation

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If a user tries to search for an explicit `\n` character in a PCRE2
regex, ripgrep won't report an error and instead will (likely) silently
fail to match.

Fixes #1261
This commit is contained in:
Andrew Gallant 2019-08-01 17:31:49 -04:00
parent 9268ff8e8d
commit 01e8e11621
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1 changed files with 6 additions and 1 deletions
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src/app.rs
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@ -1995,7 +1995,12 @@ or backreferences.
Note that PCRE2 is an optional ripgrep feature. If PCRE2 wasn't included in
your build of ripgrep, then using this flag will result in ripgrep printing
an error message and exiting.
an error message and exiting. PCRE2 may also have worse user experience in
some cases, since it has fewer introspection APIs than ripgrep's default regex
engine. For example, if you use a '\n' in a PCRE2 regex without the
'-U/--multiline' flag, then ripgrep will silently fail to match anything
instead of reporting an error immediately (like it does with the default
regex engine).
Related flags: --no-pcre2-unicode