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Regex list dict based Python question for beginners

https://stackoverflow.com/a/59004613/6615163

In [1]: import re                                                                        

In [2]: listA = ['123', '345', '678']                                                    

In [3]: listB = ['ABC123', 'CDE455', 'GHK678', 'CGH345']                                 

In [4]: # Mapping b/w number in listB to related index                                   

In [5]: mapping = {re.sub(r'\D+', '', value).strip(): index for index, value in enumerate(listB)}                                                                         

In [6]: mapping # Print mapping dictionary                                               
Out[6]: {'123': 0, '455': 1, '678': 2, '345': 3}

In [7]: # Find the desired output                                                        

In [8]: output = [mapping.get(item) for item in listA]                                   

In [9]: output                                                                           
Out[9]: [0, 3, 2]

In [10]:   
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