python 正则 替换非字符串成空格

1.有个坑 re.sub('[^w]', ' ', 'hello world, get rid of comma')   --> [^w] 非字符的意思

[^abc] 匹配除了a,b,c之外的字符

import re
text_string = re.sub(r'([^sw]|_|[0-9])+',''," I 3   _ I  3 ? _ love you")
print (text_string)

I     I     love you

参考：https://www.cnblogs.com/12260420zxx/p/13663291.html
     https://blog.csdn.net/u010211479/article/details/78490854