在Python中使用正则表达式的字符串中出现次数最多的数字

给定一个字符串str ，任务是从字符串中提取所有数字并使用 Regex Python找出其中出现次数最多的元素。

• 保证没有两个元素具有相同的频率
  例子：

  Input :geek55of55geeks4abc3dr2 
  Output :55
  
  Input :abcd1def2high2bnasvd3vjhd44
  Output :2
  

  方法：使用Python正则表达式库中的re.findall()函数从字符串str中提取所有数字，并使用集合库中的Counter函数，我们可以获得出现次数最多的元素。

  下面是上述方法的Python实现

  # your code goes here# Python program to 
  # find the most occurring element 
  import re 
  from collections import Counter 
    
  def most_occr_element(word):
        
      # re.findall will extract all the elements 
      # from the string and make a list
      arr = re.findall(r'[0-9]+', word)    
        
      # to store maxm frequency
      maxm = 0  
    
      # to store maxm element of most frequency
      max_elem = 0
        
      # counter will store all the number with 
      # their frequencies
      # c = counter((55, 2), (2, 1), (3, 1), (4, 1))    
      c = Counter(arr)
      
      # Store all the keys of counter in a list in
      # which first would we our required element    
      for x in list(c.keys()):
    
          if c[x]>= maxm:
              maxm = c[x]
              max_elem = int(x)
                    
      return max_elem
    
  # Driver program 
  if __name__ == "__main__": 
      word = 'geek55of55gee4ksabc3dr2x'
      print(most_occr_element(word))
  

  输出：

  55