a simple command that splits up a string into numbers and letters

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Hey all,

i am looking for an easy way to split a string into letters and numbers.
so if i had a string '34JKBY103' i could get ['34', 'JKBY', '103']

I could write up something, but thought that if there was already something
out there that i hav'nt found, it would probably be cleaner.
thanks

sk

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