diff --git a/testgen/generators/collation.py b/testgen/generators/collation.py
index 38cda832..55aa9d11 100644
--- a/testgen/generators/collation.py
+++ b/testgen/generators/collation.py
@@ -59,9 +59,9 @@ def set_patterns(self):
         ]
 
         # For detecting and converting \x, \u, and \U coded values
-        self.xcoding = re.compile("\\\\x([0-9A-Fa-f]{2})")
-        self.escaped_ucoding = re.compile("\\\\u([0-9A-Fa-f]{4})")
-        self.escaped_bigU_coding = re.compile("\\\\U([0-9A-Fa-f]{8})")
+        self.xcoding = re.compile(r"\\x([0-9A-Fa-f]{2})")
+        self.escaped_ucoding = re.compile(r"\\u([0-9A-Fa-f]{4})")
+        self.escaped_bigU_coding = re.compile(r"\\U([0-9A-Fa-f]{8})")
 
     def process_test_data(self):
         # Get each kind of collation tests and create a unified data set
diff --git a/testgen/generators/number_fmt.py b/testgen/generators/number_fmt.py
index c96ba742..46505b5a 100644
--- a/testgen/generators/number_fmt.py
+++ b/testgen/generators/number_fmt.py
@@ -5,7 +5,7 @@
 import re
 from generators.base import DataGenerator
 
-reblankline = re.compile("^\s*$")
+reblankline = re.compile(r"^\s*$")
 
 # Global constants
 # Values to be formatted in number format tests
@@ -166,7 +166,7 @@ def parseNumberFmtTestData(self, rawtestdata):
     # Source data: https://github.com/unicode-org/icu/blob/main/icu4c/source/test/testdata/dcfmtest.txt
     def generateDcmlFmtTestDataObjects(self, rawtestdata, count=0):
         original_count = count
-        recommentline = re.compile("^\s*#")
+        recommentline = re.compile(r"^\s*#")
         test_list = rawtestdata.splitlines()
 
         all_tests_list = []
diff --git a/testgen/generators/plurals.py b/testgen/generators/plurals.py
index a0eee703..e5ffb57e 100644
--- a/testgen/generators/plurals.py
+++ b/testgen/generators/plurals.py
@@ -8,7 +8,7 @@
 
 from generators.base import DataGenerator
 
-reblankline = re.compile("^\s*$")
+reblankline = re.compile(r"^\s*$")
 
 class PluralGenerator(DataGenerator):
     def plurals_descriptor(self):