I tried (. ?):(. )((?::). )? to test below:

androidx.hilt:hilt-compiler

• group1: androidx.hilt
• group2: hilt-compiler
• group3:

androidx.hilt:hilt-compiler:1.2.3

• group1: androidx.hilt
• group2: hilt-compiler:1.2.3
• group3:

I expect second one to be

• group1: androidx.hilt
• group2: hilt-compiler
• group3: 1.2.3

I have tried different regular expression but none of them works.

CodePudding user response：

You might write the pattern as:

^([^:\n] ):([^:\n] )(?::([^\n:] ))?$

Explanation

• ^ Start of string
• ([^:\n] ) Group 1, match 1 chars other than : or a newline
• :([^:\n] ) Match : followed by group 2 matching 1 chars other than : or a newline
• (?: Non capture group
  • :([^\n:] ) Match : followed by group 3 matching 1 chars other than : or a newline
• )? Close non capture group and make it optional
• $ End of string

Regex demo