https://gitlab.com/wireshark/wireshark/-/commit/0e120834b0883c9940d31f210a51613f723ad422

From 0e120834b0883c9940d31f210a51613f723ad422 Mon Sep 17 00:00:00 2001
From: John Thacker <johnthacker@gmail.com>
Date: Thu, 10 Oct 2024 23:15:18 +0000
Subject: [PATCH] CMake: Fix our c-ares version discovery

c-ares 1.34.0 and later generate ARES_VERSION_STR using a macro, so
fetch the version from ARES_VERSION_MAJOR, ARES_VERSION_MINOR, and
ARES_VERSION_PATCH.

Fixes #20125


(cherry picked from commit 7c1418625d2ba5095ef5393abdb2141c990a662c)

Co-authored-by: Gerald Combs <gerald@wireshark.org>
--- a/cmake/modules/FindCARES.cmake
+++ b/cmake/modules/FindCARES.cmake
@@ -36,11 +36,22 @@ find_library( CARES_LIBRARY
 )
 
 # Try to retrieve version from header if found
+# Adapted from https://stackoverflow.com/a/47084079/82195
 if(CARES_INCLUDE_DIR)
-  set(_version_regex "^#define[ \t]+ARES_VERSION_STR[ \t]+\"([^\"]+)\".*")
-  file(STRINGS "${CARES_INCLUDE_DIR}/ares_version.h" CARES_VERSION REGEX "${_version_regex}")
-  string(REGEX REPLACE "${_version_regex}" "\\1" CARES_VERSION "${CARES_VERSION}")
-  unset(_version_regex)
+  file(READ "${CARES_INCLUDE_DIR}/ares_version.h" _ares_version_h)
+
+  string(REGEX MATCH "#[\t ]*define[ \t]+ARES_VERSION_MAJOR[ \t]+([0-9]+)" _ ${_ares_version_h})
+  set(_ares_version_major ${CMAKE_MATCH_1})
+  string(REGEX MATCH "#[\t ]*define[ \t]+ARES_VERSION_MINOR[ \t]+([0-9]+)" _ ${_ares_version_h})
+  set(_ares_version_minor ${CMAKE_MATCH_1})
+  string(REGEX MATCH "#[\t ]*define[ \t]+ARES_VERSION_PATCH[ \t]+([0-9]+)" _ ${_ares_version_h})
+  set(_ares_version_patch ${CMAKE_MATCH_1})
+  set(CARES_VERSION ${_ares_version_major}.${_ares_version_minor}.${_ares_version_patch})
+
+  unset(_ares_version_h)
+  unset(_ares_version_major)
+  unset(_ares_version_minor)
+  unset(_ares_version_patch)
 endif()
 
 # handle the QUIETLY and REQUIRED arguments and set CARES_FOUND to TRUE if
-- 
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