How to match everything in certain bounds using regexp in go?

Question

My goal is to get the contents of a go function.

Starting from func till the last curly brace }.

Currently i can get the function name using below code:

re := regexp.MustCompile(`func (.*) `)

but i want to get the whole contents of the function.

Tried with:

re := regexp.MustCompile(`func (.s)`)

but this isn't working, need to get all the content with newlines till the last curly brace at the end of the function.

EDIT: Manage to get the functions using this regex:

re := regexp.MustCompile(`func(.*?)[\s\S]+?(func|\z)`)

but only problem is that it is getting half of the functions(may be due to second func). Is there a way to tweak this regex to get all of the functions?

Answer 1

You can't do this, you can instruct a regex to stop at the first } it sees but what you wan't is to count how many { you have seen and stop when you find the } that matches the func {. Regexes can't do this for you.

Instead, read the file line by line and maintain a counter, increment for each { and decrement for each } util you hit 0.

Or use an actual parser like go/parser.