使用正则表达式解析字符串时出错：'NoneType'对象没有属性'group'

I've been getting the error "AttributeError: 'NoneType' object has no attribute 'group'. From my understanding that's when my regex is not returning any results. I've tried it on an online regex tester and it worked though. Can someone tell me what's going on? I'm looking to haveI've been getting the error "AttributeError: 'N