diff --git a/ci-scripts/cls_oai_html.py b/ci-scripts/cls_oai_html.py
index 6e29063192..444fc68b5c 100644
--- a/ci-scripts/cls_oai_html.py
+++ b/ci-scripts/cls_oai_html.py
@@ -218,7 +218,7 @@ class HTMLManagement():
 				cmd = "sed -i -e 's/__STATE_" + self.htmlTabNames[0] + "__//' test_results.html"
 				subprocess.run(cmd, shell=True)
 			else:
-				cmd = "sed -i -e 's/__STATE_" + self.htmlTabNames[0] + "__/<span class=\"glyphicon glyphicon-remove\"><\/span>/' test_results.html"
+				cmd = "sed -i -e 's/__STATE_" + self.htmlTabNames[0] + r"__/<span class=\"glyphicon glyphicon-remove\"><\/span>/' test_results.html"
 				subprocess.run(cmd, shell=True)
 		self.htmlFooterCreated = False
 
diff --git a/ci-scripts/cls_static_code_analysis.py b/ci-scripts/cls_static_code_analysis.py
index 5ed52e4027..cc9abedf23 100644
--- a/ci-scripts/cls_static_code_analysis.py
+++ b/ci-scripts/cls_static_code_analysis.py
@@ -89,7 +89,7 @@ class StaticCodeAnalysis():
 		logging.debug('Building on server: ' + node)
 		cmd = cls_cmd.getConnection(node)
 		# on RedHat/CentOS .git extension is mandatory
-		result = re.search('([a-zA-Z0-9\:\-\.\/])+\.git', self.ranRepository)
+		result = re.search(r'([a-zA-Z0-9\:\-\.\/])+\.git', self.ranRepository)
 		if result is not None:
 			full_ran_repo_name = self.ranRepository.replace('git/', 'git')
 		else:
@@ -121,7 +121,7 @@ class StaticCodeAnalysis():
 				xmlStart = False
 				with open(filename, 'r') as logfile:
 					for line in logfile:
-						ret = re.search('cppcheck version="(?P<version>[0-9\.]+)"', str(line))
+						ret = re.search(r'cppcheck version="(?P<version>[0-9\.]+)"', str(line))
 						if ret is not None:
 						   CCR.versions[vId] = ret.group('version')
 						if re.search('RUN cat cmake_targets/log/cppcheck.xml', str(line)) is not None:
diff --git a/ci-scripts/ran.py b/ci-scripts/ran.py
index 04384ad4f4..9a69f2d747 100644
--- a/ci-scripts/ran.py
+++ b/ci-scripts/ran.py
@@ -420,7 +420,7 @@ class RANManagement():
 				if result is not None:
 					mbmsRequestMsg += 1
 			#FR1 NSA test : add new markers to make sure gNB is used
-			result = re.search('\[gNB [0-9]+\]\[RAPROC\] PUSCH with TC_RNTI 0x[0-9a-fA-F]+ received correctly, adding UE MAC Context RNTI 0x[0-9a-fA-F]+', str(line))
+			result = re.search(r'\[gNB [0-9]+\]\[RAPROC\] PUSCH with TC_RNTI 0x[0-9a-fA-F]+ received correctly, adding UE MAC Context RNTI 0x[0-9a-fA-F]+', str(line))
 			if result is not None:
 				NSA_RAPROC_PUSCH_check = 1
 
@@ -449,11 +449,11 @@ class RANManagement():
 
 
 			#count "problem receiving samples" msg
-			result = re.search('\[PHY\]\s+problem receiving samples', str(line))
+			result = re.search(r'\[PHY\]\s+problem receiving samples', str(line))
 			if result is not None:
 				pb_receiving_samples_cnt += 1
 			#count "Removing UE" msg
-			result = re.search('\[MAC\]\s+Removing UE', str(line))
+			result = re.search(r'\[MAC\]\s+Removing UE', str(line))
 			if result is not None:
 				removing_ue += 1
 			#count "X2AP-PDU"