Refine CMake regex handling for clean name calculation and version extraction

- Simplified the clean name calculation in cpp_library_setup by removing unnecessary regex escaping.
- Updated the version extraction logic in _cpp_library_add_dependency to ensure proper semantic versioning format.

These changes enhance the clarity and efficiency of the CMake configuration for the cpp-library.

Author: sean-parent

cmake/cpp-library-install.cmake

@@ -194,7 +194,7 @@ function(_cpp_library_add_dependency FIND_DEP_ARGS)
 
     # Extract version (first token that looks like a semantic version number: major.minor[.patch]...)
     set(VERSION "")
-    if(REMAINING_ARGS MATCHES "^([0-9]+\\.[0-9]+(?:\\.[0-9]+)*)")
+    if(REMAINING_ARGS MATCHES "^([0-9]+\\.[0-9]+(\\.[0-9]+)*)")
         set(VERSION "${CMAKE_MATCH_1}")
         # Remove version from args - use substring to avoid regex issues with dots
         string(LENGTH "${VERSION}" VERSION_LEN)

cpp-library.cmake

@@ -170,8 +170,8 @@ function(cpp_library_setup)
 
     # Calculate clean name (without namespace prefix) for target alias
     # If PROJECT_NAME starts with NAMESPACE-, strip it; otherwise use PROJECT_NAME as-is
-    string(REGEX ESCAPE "${ARG_NAMESPACE}" ESCAPED_NAMESPACE)
-    string(REGEX REPLACE "^${ESCAPED_NAMESPACE}-" "" CLEAN_NAME "${ARG_NAME}")
+    string(REPLACE "${ARG_NAMESPACE}-" "" CLEAN_NAME "${ARG_NAME}")
+    # If no replacement happened, CLEAN_NAME equals ARG_NAME (which is what we want)
 
     # Always prefix package name with namespace for collision prevention
     # Special case: if namespace equals clean name, don't duplicate (e.g., stlab::stlab → stlab)