How to find the line containing ^ and remove it?

Question

go

There is a data.txt file, it contains lines containing the ^ symbol, I need to find all the lines containing this symbol and delete them, tell me how to implement this

Answer 1

spoiler

package main

import (
  "bufio"
  "fmt"
  "io"
  "log"
  "os"
  "strings"
)

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

  s, err := excludeLines(r)
  if err != nil {
    log.Fatal(err)
  }

  fmt.Println(s)
}

func excludeLines(r io.Reader) (string, error) {
  var lines []string
  s := bufio.NewScanner(r)
  for s.Scan() {
    text := s.Text()

    if strings.Contains(text, "^") {
      continue
    }

    lines = append(lines, text)
  }

  err := s.Err()
  if err != nil {
    return "", errors.Wrap(err, "Scan")
  }

  return strings.Join(lines, "\n"), nil
}

https://play.golang.org/p/azNC8PXgonI