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  1. import re
  2. L1=['alpha(1) beta(4)','delta(5) gamma(6)']
  3. res = [filter(None, re.split(r'\(\d+\)\s*', item)) for item in L1]
  4. print(res)
Success #stdin #stdout 0s 9024KB
stdin
Standard input is empty
stdout
[['alpha', 'beta'], ['delta', 'gamma']]