Add test for 850: Matcher fails on zero-or-more.

spacy/tests/regression/test_issue850.py

@@ -0,0 +1,29 @@
+'''
+Test Matcher matches with '*' operator and Boolean flag
+'''
+from __future__ import unicode_literals
+import pytest
+
+from ...matcher import Matcher
+from ...vocab import Vocab
+from ...attrs import LOWER
+from ...tokens import Doc
+
+
+@pytest.mark.xfail
+def test_issue850():
+    matcher = Matcher(Vocab())
+    IS_ANY_TOKEN = matcher.vocab.add_flag(lambda x: True)
+    matcher.add_pattern(
+        "FarAway",
+        [
+            {LOWER: "bob"},
+            {'OP': '*', IS_ANY_TOKEN: True},
+            {LOWER: 'frank'}
+        ])
+    doc = Doc(matcher.vocab, words=['bob', 'and', 'and', 'cat', 'frank'])
+    match = matcher(doc)
+    assert len(match) == 1
+    start, end, label, ent_id = match 
+    assert start == 0
+    assert end == 4