GH ref, remove redundant check

Author: jbrockmendel

doc/source/whatsnew/v2.0.0.rst

@@ -1032,7 +1032,7 @@ Period
 - Bug in :meth:`Period.strftime` and :meth:`PeriodIndex.strftime`, raising ``UnicodeDecodeError`` when a locale-specific directive was passed (:issue:`46319`)
 - Bug in adding a :class:`Period` object to an array of :class:`DateOffset` objects incorrectly raising ``TypeError`` (:issue:`50162`)
 - Bug in :class:`Period` where passing a string with finer resolution than nanosecond would result in a ``KeyError`` instead of dropping the extra precision (:issue:`50417`)
-- Bug in parsing strings representing Week-periods e.g. "2017-01-23/2017-01-29" as minute-frequency instead of week-frequency (:issue:`??`)
+- Bug in parsing strings representing Week-periods e.g. "2017-01-23/2017-01-29" as minute-frequency instead of week-frequency (:issue:`50803`)
 -
 
 Plotting

pandas/_libs/tslibs/period.pyx

@@ -2684,10 +2684,7 @@ cdef parse_weekly_str(value, BaseOffset freq):
     datetime-parsing logic.  This ensures that we can round-trip with
     Period.__str__ with weekly freq.
     """
-    match = re.search(r"^\d{4}-\d{2}-\d{2}/\d{4}-\d{2}-\d{2}", value)
-    if not match:
-        raise ValueError("Could not parse as weekly-freq Period")
-
+    # GH#50803
     start, end = value.split("/")
     start = Timestamp(start)
     end = Timestamp(end)

pandas/tests/scalar/period/test_period.py

@@ -400,6 +400,7 @@ def test_period_cons_weekly(self, num, day):
         assert isinstance(result, Period)
 
     def test_parse_week_str_roundstrip(self):
+        # GH#50803
         per = Period("2017-01-23/2017-01-29")
         assert per.freq.freqstr == "W-SUN"