diff --git a/src/window.c b/src/window.c
index 5215bb8..f76812a 100644
--- a/src/window.c
+++ b/src/window.c
@@ -6751,20 +6751,22 @@
  * Return ID of added match, -1 on failure.
  */
     int
-match_add(wp, grp, pat, prio, id)
+match_add(wp, grp, pat, prio, id, pos_list)
     win_T	*wp;
     char_u	*grp;
     char_u	*pat;
     int		prio;
     int		id;
+    list_T	*pos_list;
 {
-    matchitem_T *cur;
-    matchitem_T *prev;
-    matchitem_T *m;
+    matchitem_T	*cur;
+    matchitem_T	*prev;
+    matchitem_T	*m;
     int		hlg_id;
-    regprog_T	*regprog;
+    regprog_T	*regprog = NULL;
+    int		rtype = SOME_VALID;
 
-    if (*grp == NUL || *pat == NUL)
+    if (*grp == NUL || (pat != NULL && *pat == NUL))
 	return -1;
     if (id < -1 || id == 0)
     {
@@ -6789,7 +6791,7 @@
 	EMSG2(_(e_nogroup), grp);
 	return -1;
     }
-    if ((regprog = vim_regcomp(pat, RE_MAGIC)) == NULL)
+    if (pat != NULL && (regprog = vim_regcomp(pat, RE_MAGIC)) == NULL)
     {
 	EMSG2(_(e_invarg2), pat);
 	return -1;
@@ -6810,12 +6812,111 @@
     m = (matchitem_T *)alloc(sizeof(matchitem_T));
     m->id = id;
     m->priority = prio;
-    m->pattern = vim_strsave(pat);
+    m->pattern = pat == NULL ? NULL : vim_strsave(pat);
+    m->pos.cur = 0;
     m->hlg_id = hlg_id;
     m->match.regprog = regprog;
     m->match.rmm_ic = FALSE;
     m->match.rmm_maxcol = 0;
 
+    /* Set up position matches */
+    if (pos_list != NULL)
+    {
+	linenr_T	toplnum = 0;
+	linenr_T	botlnum = 0;
+	listitem_T	*li;
+	int		i;
+
+	for (i = 0, li = pos_list->lv_first; i < MAXPOSMATCH;
+							i++, li = li->li_next)
+	{
+	    linenr_T	lnum = 0;
+	    colnr_T	col = 0;
+	    int		len = 1;
+	    list_T	*subl;
+	    listitem_T	*subli;
+	    int		error;
+
+	    if (li == NULL)
+	    {
+		m->pos.pos[i].lnum = 0;
+		break;
+	    }
+	    if (li->li_tv.v_type == VAR_LIST)
+	    {
+		subl = li->li_tv.vval.v_list;
+		if (subl == NULL)
+		    goto fail;
+		subli = subl->lv_first;
+		if (subli == NULL)
+		    goto fail;
+		lnum = get_tv_number_chk(&subli->li_tv, &error);
+		if (error == TRUE)
+		    goto fail;
+		m->pos.pos[i].lnum = lnum;
+		if (lnum == 0)
+		{
+		    --i;
+		    continue;
+		}
+		subli = subli->li_next;
+		if (subli != NULL)
+		{
+		    col = get_tv_number_chk(&subli->li_tv, &error);
+		    if (error == TRUE)
+			goto fail;
+		    subli = subli->li_next;
+		    if (subli != NULL)
+		    {
+			len = get_tv_number_chk(&subli->li_tv, &error);
+			if (error == TRUE)
+			    goto fail;
+		    }
+		}
+		m->pos.pos[i].col = col;
+		m->pos.pos[i].len = len;
+	    }
+	    else if (li->li_tv.v_type == VAR_NUMBER)
+	    {
+		if (li->li_tv.vval.v_number == 0)
+		    continue;
+		m->pos.pos[i].lnum = li->li_tv.vval.v_number;
+		m->pos.pos[i].col = 0;
+		m->pos.pos[i].len = 0;
+	    }
+	    else
+	    {
+		EMSG(_("List or number required"));
+		goto fail;
+	    }
+	    if (toplnum == 0 || lnum < toplnum)
+		toplnum = lnum;
+	    if (botlnum == 0 || lnum > botlnum)
+		botlnum = lnum;
+	}
+
+	/* Calculate top and bottom lines for redrawing area */
+	if (toplnum != 0)
+	{
+	    if (wp->w_buffer->b_mod_set)
+	    {
+		if (wp->w_buffer->b_mod_top > toplnum)
+		    wp->w_buffer->b_mod_top = toplnum;
+		if (wp->w_buffer->b_mod_bot < botlnum)
+		    wp->w_buffer->b_mod_bot = botlnum;
+	    }
+	    else
+	    {
+		wp->w_buffer->b_mod_top = toplnum;
+		wp->w_buffer->b_mod_bot = botlnum;
+	    }
+	    m->pos.toplnum = toplnum;
+	    m->pos.botlnum = botlnum;
+	    wp->w_buffer->b_mod_set = TRUE;
+	    rtype = VALID;
+	}
+    }
+
     /* Insert new match.  The match list is in ascending order with regard to
      * the match priorities. */
     cur = wp->w_match_head;
@@ -6831,8 +6932,12 @@
 	prev->next = m;
     m->next = cur;
 
-    redraw_later(SOME_VALID);
+    redraw_later(rtype);
     return id;
+
+fail:
+    vim_free(m);
+    return -1;
 }
 
 /*
@@ -6845,8 +6950,9 @@
     int		id;
     int		perr;
 {
-    matchitem_T *cur = wp->w_match_head;
-    matchitem_T *prev = cur;
+    matchitem_T	*cur = wp->w_match_head;
+    matchitem_T	*prev = cur;
+    int		rtype = SOME_VALID;
 
     if (id < 1)
     {
@@ -6872,8 +6978,25 @@
 	prev->next = cur->next;
     vim_regfree(cur->match.regprog);
     vim_free(cur->pattern);
+    if (cur->pos.toplnum != 0)
+    {
+	if (wp->w_buffer->b_mod_set)
+	{
+	    if (wp->w_buffer->b_mod_top > cur->pos.toplnum)
+		wp->w_buffer->b_mod_top = cur->pos.toplnum;
+	    if (wp->w_buffer->b_mod_bot < cur->pos.botlnum)
+		wp->w_buffer->b_mod_bot = cur->pos.botlnum;
+	}
+	else
+	{
+	    wp->w_buffer->b_mod_top = cur->pos.toplnum;
+	    wp->w_buffer->b_mod_bot = cur->pos.botlnum;
+	}
+	wp->w_buffer->b_mod_set = TRUE;
+	rtype = VALID;
+    }
     vim_free(cur);
-    redraw_later(SOME_VALID);
+    redraw_later(rtype);
     return 0;
 }