Regex based C/C++ include parser in Golang capable of dealing with comments

extract_includes.go

package main

import (
    "strings"
    "bufio"
    "regexp"
    "fmt"
)

const test_data = `
#include "want1.h"
 #include <want2.h>
 // #include <ignore.h> 
 /* #include "ignore.h" */
 /* #include "ignore.h"
*/
 /* alice */ /* bob */ #include "want3.h" /* clair */ /* /*
#include <ignore.h>
*/
/*
#include <ignore.h> */
/*
#include <ignore.h>
*/
`

var reInclude = regexp.MustCompile(`(#include\s*['"<]([^'"<>]*)['">])|(/\*)|(\*/)|(//)`)

func main() {
    inCommentBlock := false

    sc := bufio.NewScanner(strings.NewReader(test_data))
    for sc.Scan() {
        matches := reInclude.FindAllStringSubmatch(sc.Text(), -1)
        matchLoop:for _, match := range matches {
            switch {
                // Matched include
                case len(match[2]) != 0:
                    if inCommentBlock {
                        continue
                    }
                    fmt.Println(match[2])
                // Line comment
                case len(match[5]) != 0:
                    if !inCommentBlock {
                        break matchLoop
                    }
                // Block comment start
                case len(match[3]) != 0:
                    inCommentBlock = true
                // Block comment end
                case len(match[4]) != 0:
                    inCommentBlock = false
            }
        }
    }
}

Godbolt demo: https://godbolt.org/z/Ec7bsGvMx