在2D list python中查找最常用的数字组合

import re

def find_most_common_combination(matrix):
    combination_count = {}
    
    for row in matrix:
        for element in row:
            element_str = str(element)
            combinations = re.findall(r'\d+', element_str)
            
            for combination in combinations:
                if combination in combination_count:
                    combination_count[combination] += 1
                else:
                    combination_count[combination] = 1
    
    most_common_combinations = []
    max_count = 0
    
    for combination, count in combination_count.items():
        if count > max_count:
            most_common_combinations = [combination]
            max_count = count
        elif count == max_count:
            most_common_combinations.append(combination)
    
    return most_common_combinations

# 示例用法
matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
result = find_most_common_combination(matrix)
print(result)