Split string at upper/lower case boundaries

Question

I would like to split the following string at the upper/lower-case boundaries. How might I do this in Python and/or with a regex?

For example,

x = 'aagaaggagatataccATGAATTTGTCGGTTTACCCCAATTTAACCAAAgaaaacctgtacaa'

split_boundaries(x) = ['aagaaggagatatacc', 
                       'ATGAATTTGTCGGTTTACCCCAATTTAACCAAA',
                       'gaaaacctgtacaa']

Answer 1

Use re.findall:

import re
x = 'aagaaggagatataccATGAATTTGTCGGTTTACCCCAATTTAACCAAAgaaaacctgtacaa'

re.findall(r'[a-z]+|[A-Z]+', x)
# ['aagaaggagatatacc', 'ATGAATTTGTCGGTTTACCCCAATTTAACCAAA', 'gaaaacctgtacaa']