Add __copy__ and __deepcopy__ to _sre

Author: msimacek

graalpython/com.oracle.graal.python.test/src/tests/unittest_tags/test_re.txt

@@ -41,6 +41,7 @@
 *graalpython.lib-python.3.test.test_re.ReTests.test_character_set_errors
 *graalpython.lib-python.3.test.test_re.ReTests.test_compile
 *graalpython.lib-python.3.test.test_re.ReTests.test_constants
+*graalpython.lib-python.3.test.test_re.ReTests.test_copying
 *graalpython.lib-python.3.test.test_re.ReTests.test_debug_flag
 *graalpython.lib-python.3.test.test_re.ReTests.test_dollar_matches_twice
 *graalpython.lib-python.3.test.test_re.ReTests.test_empty_array

graalpython/lib-graalpython/_sre.py

@@ -259,6 +259,12 @@ def lastindex(self):
     def __repr__(self):
         return "<%s object; span=%r, match=%r>" % (type(self).__name__, self.span(), self.group())
 
+    def __copy__(self):
+        return self
+
+    def __deepcopy__(self, memo):
+        return self
+
 def _append_end_assert(pattern):
     if isinstance(pattern, str):
         return pattern if pattern.endswith(r"\Z") else pattern + r"\Z"
@@ -356,6 +362,12 @@ def __eq__(self, other):
     def __hash__(self):
         return hash(self.pattern) * 31 ^ hash(self.flags)
 
+    def __copy__(self):
+        return self
+
+    def __deepcopy__(self, memo):
+        return self
+
     def _search(self, pattern, string, pos, endpos, sticky=False):
         pattern = self.__tregex_compile(pattern, self.__flags_str + ("y" if sticky else ""))
         input_str = string