Replaced re with os.path.split. Fixed duplicates.

plater.py

 #!/usr/bin/env python
 import wx,time,random,threading,os,math
 import stltool
-import re
 
 class stlwrap:
     def __init__(self,obj,name=None):
@@ -133,10 +132,11 @@ class showstl(wx.Window):
             #print name
             if name.lower().endswith(".stl"):
                 #Filter out the path, just show the STL filename.
-                newname=re.match(r".*[/\\](.*?\.stl)", name.lower()).group(1)
+                #newname=re.match(r".*[/\\](.*?\.stl)", name.lower()).group(1)
+                newname=os.path.split(name.lower())[1]
                 c=1
                 while newname in self.models:
-                    newname=newname+"(%d)"%c
+                    newname=os.path.split(name.lower()+"(%d)"%c)[1]
                     c+=1
                 self.models[newname]=stltool.stl(name)
                 self.models[newname].offsets=[0,0,0]