diff --git a/tren.py b/tren.py
index 01f593d..d6df15d 100755
--- a/tren.py
+++ b/tren.py
@@ -8,7 +8,7 @@
 PROGNAME = "tren.py"
 BASENAME = PROGNAME.split(".py")[0]
 PROGENV  = BASENAME.upper()
-RCSID = "$Id: tren.py,v 1.158 2010/02/26 00:08:44 tundra Exp $"
+RCSID = "$Id: tren.py,v 1.159 2010/02/26 00:24:54 tundra Exp $"
 VERSION = RCSID.split()[2]
 
 # Copyright Information
@@ -485,17 +485,27 @@
 
                 if oldstrings:
                     
-                    # Only process leftmost occurence if global replace is off
+                    # But only process the instances the user asked for
 
-                    if not renrequest[DEFINST]:
-                        oldstrings = [oldstrings[0],]
+                    todo = []
+
+                    # Handle single instance requests
+                    
+                    if (renrequest[INSTANCEEND] == SINGLEINST) and (renrequest[INSTANCESTART] < len(oldstrings)):
+                        todo.append(oldstrings[renrequest[INSTANCESTART]])
+
+                    # Handle instance range requests
+
+                    else:
+                        todo = oldstrings[renrequest[INSTANCESTART] : renrequest[INSTANCEEND]]
+
 
                     # Replace selected substring(s).
                     # Substitute from R->L in original string
                     # so as not to mess up the replacement indicies.
 
-                    oldstrings.reverse()
-                    for i in oldstrings:
+                    todo.reverse()
+                    for i in todo:
                         newname = newname[:i] + new + newname[i + len(old):]