正则表达式匹配所有字符，但最后一次出现

Question

I'm trying to put together a Regex matching all but last occurrence of a specific character (say exclamation mark ! ), into a group, and then everything else into another group.

Examples:

a!1

• G1: a
• G2: 1

a!!1

• G1: a!
• G2: 1

a!1!a!!a

• G1: a!1!a!
• G2: a

It is safe to assume that the special character cannot be at the start, or the end of the string.

Ideally I want all this to be achieved in

• one Regex
• no additional manipulation with strings
• without using RightToLeft

Thanks, Stevo

Answer 1

(.*)\!(.*)

匹配的测试输入/输出在这里http://www.myregextester.com/index.php

Answer 2

this should catch anything before the last ! in a capturing group, and everything after in the other capturing group

(.*)!([^!]*)