Index: tools/clang-format/clang-format-diff.py
===================================================================
--- tools/clang-format/clang-format-diff.py
+++ tools/clang-format/clang-format-diff.py
@@ -66,7 +66,7 @@
   filename = None
   lines_by_file = {}
   for line in sys.stdin:
-    match = re.search('^\+\+\+\ (.*?/){%s}(\S*)' % args.p, line)
+    match = re.search(r'^\+\+\+\ (.*?/){%s}(\S*)' % args.p, line)
     if match:
       filename = match.group(2)
     if filename == None:
@@ -79,7 +79,7 @@
       if not re.match('^%s$' % args.iregex, filename, re.IGNORECASE):
         continue
 
-    match = re.search('^@@.*\+(\d+)(,(\d+))?', line)
+    match = re.search(r'^@@.*\+(\d+)(,(\d+))?', line)
     if match:
       start_line = int(match.group(1))
       line_count = 1
Index: tools/scan-build-py/libscanbuild/analyze.py
===================================================================
--- tools/scan-build-py/libscanbuild/analyze.py
+++ tools/scan-build-py/libscanbuild/analyze.py
@@ -97,7 +97,7 @@
     when compiler wrappers are used. That's the moment when build setup
     check the compiler and capture the location for the build process. """
 
-    return len(args) and not re.search('configure|autogen', args[0])
+    return len(args) and not re.search(r'configure|autogen', args[0])
 
 
 def prefix_with(constant, pieces):
Index: tools/scan-build/bin/set-xcode-analyzer
===================================================================
--- tools/scan-build/bin/set-xcode-analyzer
+++ tools/scan-build/bin/set-xcode-analyzer
@@ -42,7 +42,7 @@
         if line.find("Static Analyzer") >= 0:
           foundAnalyzer = True
       else:
-        m = re.search('^(\s*ExecPath\s*=\s*")', line)
+        m = re.search(r'^(\s*ExecPath\s*=\s*")', line)
         if m:
           line = "".join([m.group(0), pathToChecker, '";\n'])
           # Do not modify further ExecPath's later in the xcspec.