extmod/modure: Add match.groups() method, and tests.

This feature is controlled at compile time by MICROPY_PY_URE_MATCH_GROUPS,
disabled by default.

Thanks to @dmazzella for the original patch for this feature; see #3770.

1 files changed, 33 insertions, 0 deletions

diff --git a/tests/extmod/ure_groups.py b/tests/extmod/ure_groups.py
new file mode 100644
index 000000000..4fac896d7
--- /dev/null
+++ b/tests/extmod/ure_groups.py
@@ -0,0 +1,33 @@
+# test match.groups()
+
+try:
+    import ure as re
+except ImportError:
+    try:
+        import re
+    except ImportError:
+        print("SKIP")
+        raise SystemExit
+
+try:
+    m = re.match(".", "a")
+    m.groups
+except AttributeError:
+    print('SKIP')
+    raise SystemExit
+
+
+m = re.match(r'(([0-9]*)([a-z]*)[0-9]*)','1234hello567')
+print(m.groups())
+
+m = re.match(r'([0-9]*)(([a-z]*)([0-9]*))','1234hello567')
+print(m.groups())
+
+# optional group that matches
+print(re.match(r'(a)?b(c)', 'abc').groups())
+
+# optional group that doesn't match
+print(re.match(r'(a)?b(c)', 'bc').groups())
+
+# only a single match
+print(re.match(r'abc', 'abc').groups())