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-rw-r--r--usr.bin/sed/sed.118
1 files changed, 13 insertions, 5 deletions
diff --git a/usr.bin/sed/sed.1 b/usr.bin/sed/sed.1
index 31286c5671fc..936b754c8b20 100644
--- a/usr.bin/sed/sed.1
+++ b/usr.bin/sed/sed.1
@@ -43,11 +43,11 @@
.Nd stream editor
.Sh SYNOPSIS
.Nm sed
-.Op Fl an
+.Op Fl Ean
.Ar command
.Op Ar file ...
.Nm sed
-.Op Fl an
+.Op Fl Ean
.Op Fl e Ar command
.Op Fl f Ar command_file
.Op Ar file ...
@@ -70,6 +70,11 @@ regardless of their origin.
.Pp
The following options are available:
.Bl -tag -width indent
+.It Fl E
+Interpret regular expressions as extended (modern) regular expressions
+rather than basic regular expressions (BRE's). The
+.Xr re_format 7
+manual page fully describes both formats.
.It Fl a
The files listed as parameters for the
.Dq w
@@ -164,10 +169,13 @@ The
.Nm
regular expressions are basic regular expressions (BRE's, see
.Xr regex 3
-for more information).
-In addition,
+for more information) by default.
+.Nm
+can use extended (modern) regular expressions instead if the
+.Fl E
+flag is given. In addition,
.Nm
-has the following two additions to BRE's:
+has the following two additions to regular expressions:
.sp
.Bl -enum -compact
.It