--- a/wx/lib/docview.py
+++ b/wx/lib/docview.py
@@ -1034,7 +1034,7 @@ class DocTemplate(wx.Object):
         string will be displayed in the file filter list of Windows file
         selectors.
 
-        filter is an appropriate file filter such as \*.txt.
+        filter is an appropriate file filter such as *.txt.
 
         dir is the default directory to use for file selectors.
 
--- a/wx/lib/layoutf.py
+++ b/wx/lib/layoutf.py
@@ -132,8 +132,8 @@ class Layoutf(wx.LayoutConstraints):
              'r': 'wx.Right', 'h': 'wx.Height', 'w': 'wx.Width',
              'x': 'wx.CentreX', 'y': 'wx.CentreY' }
 
-    rexp1 = re.compile('^\s*([tlrbhwxy])\s*([!\?\*])\s*(\d*)\s*$')
-    rexp2 = re.compile('^\s*([tlrbhwxy])\s*([=%<>^_])\s*([tlrbhwxy]?)\s*(\d*)\s*#(\d+)\s*$')
+    rexp1 = re.compile(r'^\s*([tlrbhwxy])\s*([!\?\*])\s*(\d*)\s*$')
+    rexp2 = re.compile(r'^\s*([tlrbhwxy])\s*([=%<>^_])\s*([tlrbhwxy]?)\s*(\d*)\s*#(\d+)\s*$')
 
     def __init__(self,pstr=None,winlist=None):
         wx.LayoutConstraints.__init__(self)
--- a/wx/lib/wxpTag.py
+++ b/wx/lib/wxpTag.py
@@ -45,7 +45,7 @@ The name-value pairs in all the nested P
 strings into a python dictionary and passed to the __init__ method of
 the class as keyword arguments.  This means that they are all
 accessible from the __init__ method as regular parameters, or you use
-the special Python \*\*kw syntax in your __init__ method to get the
+the special Python **kw syntax in your __init__ method to get the
 dictionary directly.
 
 Some parameter values are special and if they are present then they will
--- a/wx/tools/pywxrc.py
+++ b/wx/tools/pywxrc.py
@@ -521,7 +521,7 @@ class XmlResourceCompiler:
         # Generate subclasses
         for subclass in subclasses:
             windowClass = bases[subclass]
-            subclass = re.sub("^\S+\.", "", subclass)
+            subclass = re.sub(r"^\S+\.", "", subclass)
             windowClass = re.sub("^wx", "", windowClass)
             outputList.append(self.templates.SUBCLASS_HEADER % locals())
             outputList.append('\n')
@@ -766,8 +766,8 @@ class XmlResourceCompiler:
             \n => \\n
             \r => \\r
             \t => \\t
-            \ => \\
-            " => \"
+            \\ => \\\\
+            " => \\"
 
         Returns result as string, which is bytes in py2 or unicode in py3.
         """