Add regular expression support for the format search, match and

substitute modifiers.

Makefile

@@ -32,7 +32,6 @@ SRCS=	alerts.c \
 	cmd-list-panes.c \
 	cmd-list-sessions.c \
 	cmd-list-windows.c \
-	cmd-list.c \
 	cmd-load-buffer.c \
 	cmd-lock-server.c \
 	cmd-move-window.c \
@@ -96,6 +95,7 @@ SRCS=	alerts.c \
 	paste.c \
 	proc.c \
 	procname.c \
+	regsub.c \
 	resize.c \
 	screen-redraw.c \
 	screen-write.c \