Make backreference support clear.

Fixes #268.
2016-12-12 07:03:37 -05:00
parent 652c70f207
commit 8396d3ffaa
4 changed files with 23 additions and 4 deletions
--- a/doc/rg.1
+++ b/doc/rg.1
@@ -24,6 +24,11 @@ rg [\f[I]options\f[]] \-\-version
 ripgrep (rg) combines the usability of The Silver Searcher (an ack
 clone) with the raw speed of grep.
 .PP
+ripgrep\[aq]s regex engine uses finite automata and guarantees linear
+time searching.
+Because of this, features like backreferences and arbitrary lookaround
+are not supported.
+.PP
 Project home page: https://github.com/BurntSushi/ripgrep
 .SH COMMON OPTIONS
 .TP