# Write a Python program to Maximum occurring Substring from list # Python3 code to demonstrate working of# Maximum occurring Substring from list# Using regex() + groupby() + max() + lambdaimport reimport itertools# initializing stringtest_str = "gfghsisbjknlmkesbestgfgsdcngfgcsdjnisdjnlbestdjsklgfgcdsbestbnjdsgfgdbhisbhsbestdkgfgb"test_list = ['gfg', 'is', 'best']# printing original string and listprint("The original string is : " + test_str)print("The original list is : " + str(test_list))# Maximum occurring Substring from list# Using regex() + groupby() + max() + lambdaseqs = re.findall(str.join('|', test_list), test_str)grps = [(key, len(list(j))) for key, j in itertools.groupby(seqs)]res = max(grps, key = lambda ele : ele[1])         # printing resultprint("Maximum frequency substring : " + str(res[0]))