_impl.py: Fix alphanum character class

Fixes #9

Author: jayvdb

src/js_regex/_impl.py

@@ -55,8 +55,8 @@ def compile(pattern, flags=0):
         (r"\a", "\a"),
         (r"\d", "[0-9]"),
         (r"\D", "[^0-9]"),
-        (r"\w", "[A-Za-z]"),
-        (r"\W", "[^A-Za-z]"),
+        (r"\w", "[A-Za-z0-9_]"),
+        (r"\W", "[^A-Za-z0-9_]"),
         (r"\s", "[ \t\n\r\x0b\x0c]"),
         (r"\S", "[^ \t\n\r\x0b\x0c]"),
     ]:

test_js_regex.py

@@ -41,6 +41,8 @@ def test_expected_transforms(pattern, good_match, bad_match):
         pytest.param(r"\d", "1", "߀", marks=SKIP_ON_PY2),  # NKO DIGIT ZERO
         (r"\D", "߀", "1"),
         pytest.param(r"\w", "a", "é", marks=SKIP_ON_PY2),  # Latin-1 e-acute
+        (r"\w", "1", "߀"),
+        (r"\w", "_", "/"),
         (r"\W", "é", "a"),
         pytest.param(r"\s", "\t", "\xa0", marks=SKIP_ON_PY2),  # non-breaking space
         (r"\S", "\xa0", "\t"),