diff --git a/pyutil/iputil.py b/pyutil/iputil.py
index f99cbc0..1054074 100644
--- a/pyutil/iputil.py
+++ b/pyutil/iputil.py
@@ -177,16 +177,16 @@ class UnsupportedPlatformError(Exception):
 # ... thus wrote Greg Smith in time immemorial...
 _win32_path = 'route.exe'
 _win32_args = ('print',)
-_win32_re = re.compile('^\s*\d+\.\d+\.\d+\.\d+\s.+\s(?P<address>\d+\.\d+\.\d+\.\d+)\s+(?P<metric>\d+)\s*$', flags=re.M|re.I|re.S)
+_win32_re = re.compile(r'^\s*\d+\.\d+\.\d+\.\d+\s.+\s(?P<address>\d+\.\d+\.\d+\.\d+)\s+(?P<metric>\d+)\s*$', flags=re.M|re.I|re.S)
 
 # These work in Redhat 6.x and Debian 2.2 potato
 _linux_path = '/sbin/ifconfig'
-_linux_re = re.compile('^\s*inet [a-zA-Z]*:?(?P<address>\d+\.\d+\.\d+\.\d+)\s.+$', flags=re.M|re.I|re.S)
+_linux_re = re.compile(r'^\s*inet [a-zA-Z]*:?(?P<address>\d+\.\d+\.\d+\.\d+)\s.+$', flags=re.M|re.I|re.S)
 
 # NetBSD 1.4 (submitted by Rhialto), Darwin, Mac OS X
 _netbsd_path = '/sbin/ifconfig'
 _netbsd_args = ('-a',)
-_netbsd_re = re.compile('^\s+inet [a-zA-Z]*:?(?P<address>\d+\.\d+\.\d+\.\d+)\s.+$', flags=re.M|re.I|re.S)
+_netbsd_re = re.compile(r'^\s+inet [a-zA-Z]*:?(?P<address>\d+\.\d+\.\d+\.\d+)\s.+$', flags=re.M|re.I|re.S)
 
 # Irix 6.5
 _irix_path = '/usr/etc/ifconfig'
diff --git a/pyutil/platformutil.py b/pyutil/platformutil.py
index 17b146c..de7a73b 100644
--- a/pyutil/platformutil.py
+++ b/pyutil/platformutil.py
@@ -3,11 +3,11 @@
 # Thanks to Daenyth for help porting this to Arch Linux.
 
 import os, platform, re, subprocess
-_distributor_id_cmdline_re = re.compile("(?:Distributor ID:)\s*(.*)", re.I)
-_release_cmdline_re = re.compile("(?:Release:)\s*(.*)", re.I)
+_distributor_id_cmdline_re = re.compile(r"(?:Distributor ID:)\s*(.*)", re.I)
+_release_cmdline_re = re.compile(r"(?:Release:)\s*(.*)", re.I)
 
-_distributor_id_file_re = re.compile("(?:DISTRIB_ID\s*=)\s*(.*)", re.I)
-_release_file_re = re.compile("(?:DISTRIB_RELEASE\s*=)\s*(.*)", re.I)
+_distributor_id_file_re = re.compile(r"(?:DISTRIB_ID\s*=)\s*(.*)", re.I)
+_release_file_re = re.compile(r"(?:DISTRIB_RELEASE\s*=)\s*(.*)", re.I)
 
 global _distname,_version
 _distname = None
diff --git a/pyutil/test/current/test_iputil.py b/pyutil/test/current/test_iputil.py
index 4bd96bf..64c15b9 100644
--- a/pyutil/test/current/test_iputil.py
+++ b/pyutil/test/current/test_iputil.py
@@ -15,7 +15,7 @@
     from pyutil import iputil, testutil
     import re
 
-    DOTTED_QUAD_RE=re.compile("^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$")
+    DOTTED_QUAD_RE=re.compile(r"^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$")
 
     class ListAddresses(testutil.SignalMixin):
         def test_get_local_ip_for(self):
diff --git a/pyutil/test/deprecated/test_dictutil.py b/pyutil/test/deprecated/test_dictutil.py
index 156239e..2042a90 100644
--- a/pyutil/test/deprecated/test_dictutil.py
+++ b/pyutil/test/deprecated/test_dictutil.py
@@ -79,11 +79,11 @@ def _help_test_eq_but_notis(self, klass):
         d[fake3] = fake7
         d[3] = 7
         d[3] = 8
-        _assert(any(x for x in d.values() if x is 8))
+        _assert(any(x for x in d.values() if x == 8))
         _assert(any(x for x in d.values() if x is fake7))
-        _assert(not any(x for x in d.values() if x is 7)) # The real 7 should have been ejected by the d[3] = 8.
+        _assert(not any(x for x in d.values() if x == 7)) # The real 7 should have been ejected by the d[3] = 8.
         _assert(any(x for x in d if x is fake3))
-        _assert(any(x for x in d if x is 3))
+        _assert(any(x for x in d if x == 3))
         d[fake3] = 8
 
         d.clear()
@@ -92,11 +92,11 @@ def _help_test_eq_but_notis(self, klass):
         fake7 = EqButNotIs(7)
         d[fake3] = fake7
         d[3] = 8
-        _assert(any(x for x in d.values() if x is 8))
+        _assert(any(x for x in d.values() if x == 8))
         _assert(any(x for x in d.values() if x is fake7))
-        _assert(not any(x for x in d.values() if x is 7)) # The real 7 should have been ejected by the d[3] = 8.
+        _assert(not any(x for x in d.values() if x == 7)) # The real 7 should have been ejected by the d[3] = 8.
         _assert(any(x for x in d if x is fake3))
-        _assert(any(x for x in d if x is 3))
+        _assert(any(x for x in d if x == 3))
         d[fake3] = 8
 
     def test_em(self):
diff --git a/pyutil/version_class.py b/pyutil/version_class.py
index 9b307d9..ee883bd 100644
--- a/pyutil/version_class.py
+++ b/pyutil/version_class.py
@@ -79,8 +79,8 @@
 # applied since the last version number tag was applied.  The revision number is
 # the count of all patches that have been applied in the history.
 
-VERSION_BASE_RE_STR="(\d+)(\.(\d+)(\.(\d+))?)?((a|b|c)(\d+))?(\.dev(\d+))?"
-VERSION_SUFFIX_RE_STR="(-(\d+|r\d+)|.post\d+)?"
+VERSION_BASE_RE_STR=r"(\d+)(\.(\d+)(\.(\d+))?)?((a|b|c)(\d+))?(\.dev(\d+))?"
+VERSION_SUFFIX_RE_STR=r"(-(\d+|r\d+)|.post\d+)?"
 VERSION_RE_STR=VERSION_BASE_RE_STR + VERSION_SUFFIX_RE_STR
 VERSION_RE=re.compile("^" + VERSION_RE_STR + "$")