解析文件中的每一行之后，scanner.Text（）的类型是什么？

Question

I am currently reading a text file input.txt with the following inputs:

123
456
789

The code to parse it is:

package main

import (
    "bufio"
    "fmt"
    "os"
)

func main() {
    file, err := os.Open("input.txt")
    if err != nil {
        log.Fatal(err)
    }   
    defer file.Close()

    scanner := bufio.NewScanner(file)
    count := 0
    var line string
    for scanner.Scan() {
        count += 1
        line = scanner.Text()
        fmt.Println(line)
        if line == "123" {
            fmt.Println("EQUAL")
        }   
    }
}

Why does the first line of the file not match the hard coded string 123 in the code?

Answer 1

As mentioned in the comments, this is due to special characters in the file. In this case the utf8 bom, but could be dos format , or other non-printable characters.