diff -r 4f495f8070af src/cmd/acme/dat.h
--- a/src/cmd/acme/dat.h	Mon Sep 12 12:36:30 2011 -0400
+++ b/src/cmd/acme/dat.h	Wed Nov 23 16:26:45 2011 +0100
@@ -271,6 +271,7 @@
 	int		taglines;
 	Rectangle	tagtop;
 	QLock	editoutlk;
+	int		backwards;
 };
 
 void	wininit(Window*, Window*, Rectangle);
diff -r 4f495f8070af src/cmd/acme/exec.c
--- a/src/cmd/acme/exec.c	Mon Sep 12 12:36:30 2011 -0400
+++ b/src/cmd/acme/exec.c	Wed Nov 23 16:26:45 2011 +0100
@@ -49,6 +49,7 @@
 void	paste(Text*, Text*, Text*, int, int, Rune*, int);
 void	put(Text*, Text*, Text*, int, int, Rune*, int);
 void	putall(Text*, Text*, Text*, int, int, Rune*, int);
+void	rev(Text*, Text*, Text*, int, int, Rune*, int);
 void	sendx(Text*, Text*, Text*, int, int, Rune*, int);
 void	sort(Text*, Text*, Text*, int, int, Rune*, int);
 void	tab(Text*, Text*, Text*, int, int, Rune*, int);
@@ -87,6 +88,7 @@
 static Rune LPut[] = { 'P', 'u', 't', 0 };
 static Rune LPutall[] = { 'P', 'u', 't', 'a', 'l', 'l', 0 };
 static Rune LRedo[] = { 'R', 'e', 'd', 'o', 0 };
+static Rune LRev[] = { 'R', 'e', 'v', 0 };
 static Rune LSend[] = { 'S', 'e', 'n', 'd', 0 };
 static Rune LSnarf[] = { 'S', 'n', 'a', 'r', 'f', 0 };
 static Rune LSort[] = { 'S', 'o', 'r', 't', 0 };
@@ -118,6 +120,7 @@
 	{ LPut,		put,		FALSE,	XXX,		XXX		},
 	{ LPutall,		putall,	FALSE,	XXX,		XXX		},
 	{ LRedo,		undo,	FALSE,	FALSE,	XXX		},
+	{ LRev,		rev,	FALSE,	FALSE,	XXX		},
 	{ LSend,		sendx,	TRUE,	XXX,		XXX		},
 	{ LSnarf,		cut,		FALSE,	TRUE,	FALSE	},
 	{ LSort,		sort,		FALSE,	XXX,		XXX		},
@@ -402,6 +405,22 @@
 }
 
 void
+rev(Text *et, Text *_1, Text *_2, int _3, int _4, Rune *_5, int _6)
+{
+	USED(_1);
+	USED(_2);
+	USED(_3);
+	USED(_4);
+	USED(_4);
+	USED(_6);
+
+	if (et->w->backwards) 
+		et->w->backwards = 0;
+	else 
+		et->w->backwards = 1;
+}
+
+void
 sort(Text *et, Text *_0, Text *_1, int _2, int _3, Rune *_4, int _5)
 {
 	USED(_0);
diff -r 4f495f8070af src/cmd/acme/fns.h
--- a/src/cmd/acme/fns.h	Mon Sep 12 12:36:30 2011 -0400
+++ b/src/cmd/acme/fns.h	Wed Nov 23 16:26:45 2011 +0100
@@ -83,6 +83,7 @@
 void *erealloc(void*, uint);
 char	*estrdup(char*);
 Range		address(uint, Text*, Range, Range, void*, uint, uint, int (*)(void*, uint),  int*, uint*);
+Range	regexp(uint showerr, Text *t, Range lim, Range r, Rune *pat, int dir, int *foundp);
 int		rxexecute(Text*, Rune*, uint, uint, Rangeset*);
 int		rxbexecute(Text*, uint, Rangeset*);
 Window*	makenewwindow(Text *t);
diff -r 4f495f8070af src/cmd/acme/look.c
--- a/src/cmd/acme/look.c	Mon Sep 12 12:36:30 2011 -0400
+++ b/src/cmd/acme/look.c	Wed Nov 23 16:26:45 2011 +0100
@@ -89,6 +89,10 @@
 	Plumbmsg *m;
 	Runestr dir;
 	char buf[32];
+	// for backwards search
+	int eval;
+	Range ra;
+	Rune *pat;
 
 	ct = seltext;
 	if(ct == nil)
@@ -182,6 +186,12 @@
 		bufread(&t->file->b, q0, r, q1-q0);
 		m->data = runetobyte(r, q1-q0);
 		m->ndata = strlen(m->data);
+		if (t->w != nil && t->w->backwards) {
+			pat = runemalloc(q1-q0+1);
+			for (eval = 0; eval < q1-q0; eval++)
+				pat[eval] = r[eval];
+			pat[q1-q0] = 0;
+		}
 		free(r);
 		if(m->ndata<messagesize-1024 && plumbsendtofid(plumbsendfid, m) >= 0){
 			plumbfree(m);
@@ -192,11 +202,27 @@
 	}
 
 	/* interpret alphanumeric string ourselves */
-	if(expanded == FALSE)
+	if(expanded == FALSE) {
+		if (t->w != nil && t->w->backwards) {
+			free(pat);
+		}
 		return;
+	}
 	if(e.name || e.u.at)
 		openfile(t, &e);
 	else{
+		if (t->w != nil && t->w->backwards) {
+			ra = range(e.q0, e.q1);
+			ra = regexp(TRUE, t, range(-1,-1), ra, pat, '-', &eval);
+			if (ra.q0 < 0 || ra.q1 < 0) {
+				goto Return;
+			}		
+			textshow(t, ra.q0, ra.q1, 1);
+			winsettag(t->w);
+			seltext = t;
+			moveto(mousectl, addpt(frptofchar(&t->fr, t->fr.p0), Pt(4, font->height-4)));
+			goto Return;
+		}
 		if(t->w == nil)
 			return;
 		ct = &t->w->body;
@@ -215,6 +241,9 @@
 	}
 
    Return:
+	if (t->w != nil && t->w->backwards) {
+		free(pat);
+	}
 	free(e.name);
 	free(e.bname);
 }
@@ -640,7 +669,7 @@
 			e->jump = FALSE;
 	}
 
-	if(expandfile(t, q0, q1, e))
+	if(expandfile(t, q0, q1, e)) 
 		return TRUE;
 
 	if(q0 == q1){
diff -r 4f495f8070af src/cmd/acme/wind.c
--- a/src/cmd/acme/wind.c	Mon Sep 12 12:36:30 2011 -0400
+++ b/src/cmd/acme/wind.c	Wed Nov 23 16:26:45 2011 +0100
@@ -408,7 +408,7 @@
 	Rune *new, *old, *r;
 	uint q0, q1;
 	static Rune Ldelsnarf[] = { ' ', 'D', 'e', 'l', ' ',
-		'S', 'n', 'a', 'r', 'f', 0 };
+		'S', 'n', 'a', 'r', 'f', ' ', 'R', 'e', 'v', 0 };
 	static Rune Lundo[] = { ' ', 'U', 'n', 'd', 'o', 0 };
 	static Rune Lredo[] = { ' ', 'R', 'e', 'd', 'o', 0 };
 	static Rune Lget[] = { ' ', 'G', 'e', 't', 0 };
@@ -439,8 +439,8 @@
 	i = 0;
 	runemove(new+i, w->body.file->name, w->body.file->nname);
 	i += w->body.file->nname;
-	runemove(new+i, Ldelsnarf, 10);
-	i += 10;
+	runemove(new+i, Ldelsnarf, 14);
+	i += 14;
 	if(w->filemenu){
 		if(w->body.needundo || w->body.file->delta.nc>0 || w->body.ncache){
 			runemove(new+i, Lundo, 5);