文本过滤（python正则）

https://regexr.com/

实战例子

1、保留中文（将非中文替换为" "）

def filterCharacter(s):
    import re
    r1 = re.sub(u"[^\u4e00-\u9fa5]", " ", s)
    return r1

2、连续空格替换为单空格

def filterCharacter(s):
    import re
    r1 = re.sub(r"\s{1,}", " ", s)
    return r1

3、去掉标点数字等信息

def filterCharacter(s):
    import re
    r1 = re.sub("[A-Za-z0-9\[\`\~\!\@\#\$\^\&\*\(\)\=\|\{\}\'\:\;\'\,\[\]\.\<\>\/\?\~\！\@\#\\\&\*\%]", "", s)
    return r1

注意事项

转义字符情况：
https://www.cnblogs.com/dyfblog/p/6088582.html
<<<未完待续