替换单词和字符串 pandas

问题描述

    dataframe = pd.DataFrame({'Date':['This 1A1619 person BL171111 the A-1-24',
                                  'dont Z112 but NOT 1-22-2001',
                                  'mix: 1A25629Q88 or A13B ok'],
                          'IDs': ['A11','B22','C33'],
                          })

           Date                                 IDs
0   This 1A1619 person BL171111 the A-1-24      A11
1   dont Z112 but NOT 1-22-2001                 B22
2   mix: 1A25629Q88 or A13B ok                  C33

我上面有数据框.我的目标是替换所有不带连字符-的混合单词/数字组合，例如1A1619I或BL171111或A13B，但不是带有字母M的1-22-2001或A-1-24.我试图通过>识别字母/使用正则表达式并存储在字典中的数字组合

I have the dataframe above. My goal is to replace all mixed word/number combo's WITHOUT hyphens - e.g. 1A1619I or BL171111 or A13B but NOT 1-22-2001 or A-1-24 with the letter M. I have attempted to use the code below via identify letter/number combinations using regex and storing in dictionary

dataframe['MixedNum'] = dataframe['Date'].str.replace(r'(?=.*[a-zA-Z])(\S+\S+\S+)','M')

但是我得到了这个输出

                          Date              IDs     MixedNum
0   This 1A1619 person BL171111 the A-1-24  A11     M M M M M M M
1   dont Z112 but NOT 1-22-2001             B22     M M M M 1-22-2001
2   mix: 1A25629Q88 or A13B ok              C33     M M or M ok

当我真的想要此输出时

                          Date              IDs     MixedNum
0   This 1A1619 person BL171111 the A-1-24  A11     This M person M the A-1-24
1   dont Z112 but NOT 1-22-2001             B22     dont M but NOT 1-22-2001
2   mix: 1A25629Q88 or A13B ok              C33     mix: M or M ok

我也尝试过这里建议的正则表达式，但对我也没有用正则表达式替换混合数字和字符串

I also tried the regex suggested here but it also didnt work for meRegex replace mixed number+strings

有人可以帮我修改我的正则表达式吗? r'(?=.*[a-zA-Z])(\S+\S+\S+

Can anyone help me alter my regex? r'(?=.*[a-zA-Z])(\S+\S+\S+

推荐答案

您可以使用

pat = r'(?<!\S)(?:[a-zA-Z]+\d|\d+[a-zA-Z])[a-zA-Z0-9]*(?!\S)'
dataframe['MixedNum'] = dataframe['Date'].str.replace(pat, 'M')

输出:

>>> dataframe
                                     Date  IDs                    MixedNum
0  This 1A1619 person BL171111 the A-1-24  A11  This M person M the A-1-24
1             dont Z112 but NOT 1-22-2001  B22    dont M but NOT 1-22-2001
2              mix: 1A25629Q88 or A13B ok  C33              mix: M or M ok

模式详细信息

• (?<!\S)-空格或字符串开头应紧邻当前位置
• (?:[a-zA-Z]+\d|\d+[a-zA-Z])-要么
  • [a-zA-Z]+\d-1个以上字母和一个数字
  • |-或
  • \d+[a-zA-Z]-1个以上的数字和一个字母
  • (?<!\S) - a whitespace or start of string should immediately precede the current location
  • (?:[a-zA-Z]+\d|\d+[a-zA-Z]) - either
    • [a-zA-Z]+\d - 1+ letters and a digit
    • | - or
    • \d+[a-zA-Z] - 1+ digits and a letter

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