[clang] fix(clang/**.py): fix invalid escape sequences (PR #94029)

[Eisuke Kawashima via cfe-commits]

https://github.com/e-kwsm updated https://github.com/llvm/llvm-project/pull/94029

>From 8ebfa30beff75a80601ae88c878beffe31a3f310 Mon Sep 17 00:00:00 2001
From: Eisuke Kawashima <e-kwsm at users.noreply.github.com>
Date: Sat, 11 May 2024 02:39:21 +0900
Subject: [PATCH] fix(clang/**.py): fix invalid escape sequences

---
 clang/docs/tools/dump_ast_matchers.py       | 10 +++++-----
 clang/test/Analysis/check-analyzer-fixit.py |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/clang/docs/tools/dump_ast_matchers.py b/clang/docs/tools/dump_ast_matchers.py
index 705ff0d4d40985..d47111819a1e2d 100755
--- a/clang/docs/tools/dump_ast_matchers.py
+++ b/clang/docs/tools/dump_ast_matchers.py
@@ -86,11 +86,11 @@ def extract_result_types(comment):
     parsed.
     """
     result_types = []
-    m = re.search(r"Usable as: Any Matcher[\s\n]*$", comment, re.S)
+    m = re.search("Usable as: Any Matcher[\\s\n]*$", comment, re.S)
     if m:
         return ["*"]
     while True:
-        m = re.match(r"^(.*)Matcher<([^>]+)>\s*,?[\s\n]*$", comment, re.S)
+        m = re.match("^(.*)Matcher<([^>]+)>\\s*,?[\\s\n]*$", comment, re.S)
         if not m:
             if re.search(r"Usable as:\s*$", comment):
                 return result_types
@@ -101,9 +101,9 @@ def extract_result_types(comment):
 
 
 def strip_doxygen(comment):
-    """Returns the given comment without \-escaped words."""
+    r"""Returns the given comment without \-escaped words."""
     # If there is only a doxygen keyword in the line, delete the whole line.
-    comment = re.sub(r"^\\[^\s]+\n", r"", comment, flags=re.M)
+    comment = re.sub("^\\\\[^\\s]+\n", r"", comment, flags=re.M)
 
     # If there is a doxygen \see command, change the \see prefix into "See also:".
     # FIXME: it would be better to turn this into a link to the target instead.
@@ -236,7 +236,7 @@ def act_on_decl(declaration, comment, allowed_types):
 
         # Parse the various matcher definition macros.
         m = re.match(
-            """.*AST_TYPE(LOC)?_TRAVERSE_MATCHER(?:_DECL)?\(
+            r""".*AST_TYPE(LOC)?_TRAVERSE_MATCHER(?:_DECL)?\(
                        \s*([^\s,]+\s*),
                        \s*(?:[^\s,]+\s*),
                        \s*AST_POLYMORPHIC_SUPPORTED_TYPES\(([^)]*)\)
diff --git a/clang/test/Analysis/check-analyzer-fixit.py b/clang/test/Analysis/check-analyzer-fixit.py
index b616255de89b0c..43968f4b1b6e8d 100644
--- a/clang/test/Analysis/check-analyzer-fixit.py
+++ b/clang/test/Analysis/check-analyzer-fixit.py
@@ -55,7 +55,7 @@ def run_test_once(args, extra_args):
     # themselves.  We need to keep the comments to preserve line numbers while
     # avoiding empty lines which could potentially trigger formatting-related
     # checks.
-    cleaned_test = re.sub("// *CHECK-[A-Z0-9\-]*:[^\r\n]*", "//", input_text)
+    cleaned_test = re.sub("// *CHECK-[A-Z0-9\\-]*:[^\r\n]*", "//", input_text)
     write_file(temp_file_name, cleaned_test)
 
     original_file_name = temp_file_name + ".orig"