Add period to legal prefix chars (#301)

* Add period to legal prefix chars

* Update test_parsers.py

Author: matentzn

sssom/util.py

@@ -945,7 +945,7 @@ class NoCURIEException(ValueError):
     """An exception raised when a CURIE can not be parsed with a given prefix map."""
 
 
-CURIE_RE = re.compile(r"[A-Za-z0-9_]+[:][A-Za-z0-9_]")
+CURIE_RE = re.compile(r"[A-Za-z0-9_.]+[:][A-Za-z0-9_]")
 
 
 def is_curie(string: str) -> bool:

tests/test_parsers.py

@@ -98,7 +98,7 @@ def test_parse_obographs(self):
             write_table(msdf, file)
         self.assertEqual(
             len(msdf.df),
-            9876,
+            9880,
             f"{self.obographs_file} has the wrong number of mappings.",
         )