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to_offset was not using the compiled regex #40138

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2 changes: 1 addition & 1 deletion pandas/_libs/tslibs/offsets.pyx
Original file line number Diff line number Diff line change
Expand Up @@ -3579,7 +3579,7 @@ cpdef to_offset(freq):
stride_sign = None

try:
split = re.split(opattern, freq)
split = opattern.split(freq)
if split[-1] != "" and not split[-1].isspace():
# the last element must be blank
raise ValueError("last element must be blank")
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