1) Parse a list of words 2) Change words in a text if the word is contained in the list. The change should be from word to <word> 3) Print result

long.txt

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main.go

package main

import (
  "os"
  "fmt"
  "bufio"
  "io/ioutil"
  "regexp"
)

var (
  entries []string
)

func subString(s string) string {
  for _, entry := range entries {
    if entry == s {
      return fmt.Sprintf("<%s>", s)
    }
  }
  return s
}

func main() {
  wordsPath := "/usr/share/dict/words"
  wordsFile, _ := os.Open(wordsPath)
  scanner := bufio.NewScanner(wordsFile)
  for scanner.Scan() {
    entries = append(entries, scanner.Text())
  }

  fileContents, _ := ioutil.ReadFile("long.txt")
  fileString := string (fileContents)

  reg, _ := regexp.Compile("[^ \n]+")
  result := reg.ReplaceAllStringFunc(fileString, subString)

  fmt.Print(result)
}