Allow leading ! to invert trigger patterns.

1 files changed, 19 insertions, 1 deletions

diff --git a/pw.1 b/pw.1
index f4f05fc..95be260 100644
--- a/pw.1
+++ b/pw.1
@@ -191,7 +191,7 @@ and
 also terminate colon mode without executing a command. Colon commands
 are documented in the COLON COMMANDS section below.
 
-.IP "[\fIpos\fP]\fB/\fP\fIpattern\fP, [\fIpos\fP]\fB?\fP\fIpattern\fP"
+.IP "[\fIpos\fP]\fB/[!]\fP\fIpattern\fP, [\fIpos\fP]\fB?[!]\fP\fIpattern\fP"
 Set a trigger if a non-empty
 .I pattern
 is specified, or else cancel a trigger if an empty pattern is specified.
@@ -285,6 +285,24 @@ expression (ERE) or (BRE) depending on the current setting.
 This is true even if it is recalled from a history entry which had been created
 under a different mode.
 
+If the
+.I pattern
+is preceded by the character
+.B !
+then it is logically inverted. The trigger will activate on lines which do
+.I not
+match the pattern. To write an uninverted pattern which begins with
+.BR ! ,
+precede the
+.B !
+with a backslash. This is not a regex character escape sequence, but part
+of the trigger command syntax. It must not be used anywhere in a pattern,
+other than immediately after the
+.B /
+or
+.B ?
+command character.
+
 In trigger mode, the status string
 .B TRIG/
 or