Mastering Go - Second Edition

Reading a text file word by word

The technique presented in this subsection will be demonstrated by the byWord.go file and shown in four parts. As you will see in the Go code, separating the words of a line can be tricky.

The first part of this utility is as follows:

package main 
 
import ( 
    "bufio" 
    "flag" 
    "fmt" 
    "io" 
    "os" 
    "regexp" 
) 

The second code portion of byWord.go is shown in the following Go code:

func wordByWord(file string) error { 
    var err error 
    f, err := os.Open(file) 
    if err != nil { 
        return err 
    } 
    defer f.Close() 
 
    r := bufio.NewReader(f) 
    for { 
        line, err := r.ReadString('\n') 
        if err == io.EOF { 
            break 
        } else if err != nil { 
            fmt.Printf("error reading file %s", err) 
            return err 
        } 

This part of the wordByWord() function is the same as the ...