【python 正則】

查找 findall, match, search

import re
def re_match_common(pattern, string, mathod, flags = re.I|re.M):
    """正則查找通用函數
    
    :param pattern: 正則表達式
    :param string: 可用於查找的字符串
    :param mathod: 查找方法:find,findall,match,search
    :param flags: 可選標誌修飾符,默認re.I(忽略大小寫)|re.M(多行查找)
    :return result: 匹配結果
    """
    
    regex = re.compile(pattern=pattern, flags=flags)
    if mathod=='findall':
        # 返回所有匹配項--列表
        result_findall = regex.findall(string)
        return result_findall
    elif mathod=='match':
        # 只匹配字符串的首部，返回match對象
        try:
            match_ = regex.match(string).group()
            result_match = string[match_.start() : match_.end()]
            print('match匹配成功!')
        except:
            result_match = None
            print('match匹配失敗!')
        finally:
            return result_match
    elif mathod=='search':
        # 返回第一個匹配項
        search_ = regex.search(string)
        result_search = string[search_.start() : search_.end()]
        return result_search
    
if __name__=='__main__':
    text = """Dave [email protected]
              Steve [email protected]
              Rob [email protected]
              Ryan [email protected]
           """
    pattern = r'[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}'
    
    re_match_common(pattern, text, mathod='findall')

替換 sub

sub⽅法可以將匹配到的模式替換爲指定字符串，並返回所得到的新字符串

print(regex.sub('REDACTED', text))