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  1. import re
  2.  
  3. l=[["123abc","456"],["lmnop0987"]]
  4. list_1=[]
  5. for i,string in enumerate(l):
  6. if i == 0 :
  7. for j in string:
  8. list_1.append(re.findall(r'[0-9]+', j)[0])
  9. print(list_1)
Success #stdin #stdout 0.02s 27696KB
stdin
Standard input is empty
stdout
['123', '456']