diff --git a/ilcsoft/cernlib.py b/ilcsoft/cernlib.py
index 8b1e38bf..fb60da6a 100644
--- a/ilcsoft/cernlib.py
+++ b/ilcsoft/cernlib.py
@@ -183,7 +183,7 @@ def cleanupInstall(self):
         #os.chdir( self.installPath + "/build" )
 
         ## delete object files
-        os_system( "find "+self.installPath + "/build -type f -name *.o -exec rm -f {} \;" )
+        os_system( "find "+self.installPath + r"/build -type f -name *.o -exec rm -f {} \;" )
 
     def postCheckDeps(self):
         BaseILC.postCheckDeps(self)
diff --git a/ilcsoft/ilcsoft.py b/ilcsoft/ilcsoft.py
index 5973d4bc..27a2113c 100644
--- a/ilcsoft/ilcsoft.py
+++ b/ilcsoft/ilcsoft.py
@@ -80,7 +80,7 @@ def __init__(self, installPath):
         #fg: release_string might be empty, e.g. if lsb_release does not exis (MacOs)
         self.release_number = '-1'
         if len( release_string ): 
-            self.release_number = release_string[re.search('\d', release_string).start()]
+            self.release_number = release_string[re.search(r'\d', release_string).start()]
         
         for k,v in self.debugInfo.items():
             print("+", k, '\t', str(v).replace("\n","\n\t\t"))
diff --git a/ilcsoft/ninja.py b/ilcsoft/ninja.py
index e275a39b..9c389020 100644
--- a/ilcsoft/ninja.py
+++ b/ilcsoft/ninja.py
@@ -54,7 +54,7 @@ def compile(self):
     def cleanupInstall(self):
         BaseILC.cleanupInstall(self)
         os.chdir( self.installPath )
-        os_system( "find . \! -name 'ninja' -delete" )
+        os_system( r"find . \! -name 'ninja' -delete" )
 
     def postCheckDeps(self):
         BaseILC.postCheckDeps(self)
diff --git a/scripts/tagging/parseversion.py b/scripts/tagging/parseversion.py
index 3b63cb40..a5b6e385 100644
--- a/scripts/tagging/parseversion.py
+++ b/scripts/tagging/parseversion.py
@@ -57,7 +57,7 @@ def _parseVersion( self ):
       elif 'pre' in parts[2]:
         self.pre = int(parts[2].strip('pre'))
       else:
-        self.patch = int( parts[2] )
+        self.patch = int( parts[2].strip('p') )
 
     if len(parts) >= 4:
       if 'pre' == parts[3]:
diff --git a/scripts/tests/Test_Tagging.py b/scripts/tests/Test_Tagging.py
index 4aea4b8c..24a8c62f 100644
--- a/scripts/tests/Test_Tagging.py
+++ b/scripts/tests/Test_Tagging.py
@@ -211,7 +211,7 @@ def test_ctor_fail_1( self ):
                 }
               ]
 
-    with self.assertRaisesRegexp( RuntimeError, "Invalid version required"), \
+    with self.assertRaisesRegex( RuntimeError, "Invalid version required"), \
          patch( "tagging.gitinterface.Repo.getGithubTags", new=Mock( return_value=myTagInfo)):
       self.repo = Repo(owner="tester", repo="testrepo", branch="testbranch", newVersion="v01-03-20-pre", preRelease=True, dryRun=True)
 
@@ -225,7 +225,7 @@ def test_ctor_fail_2( self ):
                   "tarball_url": "tarball/v0.1"
                 }
               ]
-    with self.assertRaisesRegexp( RuntimeError, "Invalid version required"), \
+    with self.assertRaisesRegex( RuntimeError, "Invalid version required"), \
          patch( "tagging.gitinterface.Repo.getGithubTags", new=Mock( return_value=myTagInfo)):
       self.repo = Repo(owner="tester", repo="testrepo", branch="testbranch", newVersion="v01-03-19", preRelease=True, dryRun=True)
 
@@ -241,7 +241,7 @@ def test_ctor_fail_3( self ):
               ]
 
 
-    with self.assertRaisesRegexp( RuntimeError, "Invalid version required"), \
+    with self.assertRaisesRegex( RuntimeError, "Invalid version required"), \
          patch( "tagging.gitinterface.Repo.getGithubTags", new=Mock( return_value=myTagInfo)):
       self.repo = Repo(owner="tester", repo="testrepo", branch="testbranch", newVersion="v01-03-20-pre1", preRelease=True, dryRun=True)