I have a string in the following format: aaa!bbb.200 where

• aaa can be anything (any length)
• bbb can be anything (any length) except !
• ! & .200 are optional (can be any 3 digit number)

i want to capture bbb and 200

for example:

1. aaaaa!bbbb.200 i want to capture bbbb & 200
2. aaa.400 i want to capture 400
3. aaa!bb i want to capture bb

i have been able to do this with the following regex (?:.*!(.*)\.(\d{3}$)|.*!(.*)|.*\.(\d{3}$)) but it uses | which complicates the capturing groups, and also seems too long for what i need

trying to capture all but optional last, ends out consuming all string before checking optional.

CodePudding user response：

You can use

^.*?(?:!([^!]*?))?(?:\.(\d{3}))?$

See the regex demo. Details:

• ^ - start of string
• .*? - zero or more chars other than line break chars as few as possible
• (?:!([^!]*?))? - an optional sequence matching one or zero occurrences of a ! char and then any zero or more chars other than ! char as few as possible, captured into Group 1
• (?:\.(\d{3}))? - an optional sequence matching one or zero occurrences of a . char and then any thre digits, captured into Group 2
• $ - end of string.