对python数据清洗容易遇到的函数-re.sub bytes string详解

re.sub 功能，比replace强大的替换函数，将正则表达式匹配上的模块替换成repl re.sub(pattern, repl, string, count=0, flags=0) 返回最左边正则表达式限定的被repl代替的字符串，如果正则表达式没有匹配上，则字符串不做修改。 \n is converted to a single newline character, \r is converted to a carriage return, and so forth. Unknown escapes such as \j are left alone. 如果后面跟的是数字 such a