什么是“ regex grep”，应用于文件，相当于Golang？

Problem

I am now running a regex grep to multiple files in order to get all TODOs, but it takes a couple of minutes before the commands completes:

real    5m8.073s
user    0m35.593s
sys     4m17.608s

Aim

The aim is to get the number of TODOs in no time.

Attempt

According to what I have found on the internet, I think that Golang would be a good candidate and I created the following code.

func check_for_todo(path string) {
    text := "//\\sTODO\\s\\d"

    b, err := ioutil.ReadFile(path)
    if err != nil {
        panic(err)
    }
    s := string(b)

    // containsTodo := strings.Contains(s, text)
    containsTodo, _ := regexp.MatchString(text, s)

    if containsTodo {
        numberOfTodos++
        fmt.Println("This file contains a todo:", path)
    }
}

Results

The query is now twice as fast compared to bash.

real    2m17.050s
user    0m0.015s
sys     0m0.015s

Discussion

I have the feeling that this code could be optimized and is currently devious. I am now looking into channels and goroutines.

You might want to check out the optimizations made by the silver searcher (a.k.a ag). It does a number of optimizations in order to have extremely fast code search.

Another option might be to pre-construct an index so searches are even fast than anything performed in real time. In the ag README, exuberant ctags is referenced which does this and could work for extremely large code bases.