trying to recall a regex for re.split()

[snippsat]

>>> import re
>>> 
>>> n = '144mHz'
>>> re.split(r'(\d+\.?\d+)', n)[1:]
['144', 'mHz']
>>> 
>>> n = '25.99mHz'
>>> re.split(r'(\d+\.?\d+)', n)[1:]
['25.99', 'mHz']
>>> 
>>> n = '19999.9mHz'
>>> re.split(r'(\d+\.?\d+)', n)[1:]
['19999.9', 'mHz']