Issue with regex in Golang

Question

I am trying to create a regex to parse specific string .

The current string is abcd_1.263.0.15-8zz00df.yml and I want to parse only 1.263.0.15-8zz00df out of it.

Tried already with this expression "_\K.*(?=\.)" but its not working in Golan and giving me pattern error. Can someone please help with this?

Answer 1

Go uses RE2 regex engine, that does not support lookaheads, lookbehinds and other PCRE goodies like \K

See this comparison of the different regex engines.

You could however use this regex:

[^_-]+-[^.]+

See this demo.

Explained:

[^_-]+   # a character that is not "_" or "-", one or more times
-        # a literal "-"
[^.]+    # a character that is not a dot, one or more times