Regular expressions for removing repeated letters with spaces in java

Question

I need some help understanding regular expressions please. I'm trying to build some chat filters to remove spam.

So far I have (?<!'|\\w|\\s)(^[az]$)(?!\\w|\\s) which will remove 'a'

and (?<!'|\\w|\\s)(.)\\1{3,}(?!\\w|\\s) which will catch 'aaaa'

Where I need help is finding one that will catch 'aaaaaaaaaaa a'

Can some please steer me in the correct direction? Thank you very much.

Answer 1

根据上面的评论，此模式应该是您要寻找的：

^(.+?) ?(?>(?:\\1| )+)$