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import re
strs = ['a=b*c;', 'd=a+2;', 'c=0;', 'b=a;']
print([re.findall(r'[_a-z]\w*', x, re.I) for x in strs])

Success #stdin #stdout 0.01s 8968KB

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Standard input is empty

stdout

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[['a', 'b', 'c'], ['d', 'a'], ['c'], ['b', 'a']]

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Python (cpython 2.7.16)

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