Strings and Text Processing

Replace Text

strings.ReplaceAll returns a new string with every matching piece replaced.

replace Replacing text creates a changed string while leaving the original value available.

Replace Text

phrase
replace_text.go
Replay: real traced execution (multi-file project)
package main

import (
	"fmt"
	"strings"
)

func main() {
	var phrase = "go is fun"
	updated := strings.ReplaceAll(phrase, "go", "Go")
	changed := phrase != updated

	fmt.Println("phrase=", phrase)
	fmt.Println("updated=", updated)
	fmt.Println("changed=", changed)
}

package main

import (
	"fmt"
	"strings"
)

func main() {
	var phrase = "go is fast"
	updated := strings.ReplaceAll(phrase, "go", "Go")
	changed := phrase != updated

	fmt.Println("phrase=", phrase)
	fmt.Println("updated=", updated)
	fmt.Println("changed=", changed)
}

package main

import (
	"fmt"
	"strings"
)

func main() {
	var phrase = "java is fun"
	updated := strings.ReplaceAll(phrase, "go", "Go")
	changed := phrase != updated

	fmt.Println("phrase=", phrase)
	fmt.Println("updated=", updated)
	fmt.Println("changed=", changed)
}

  1. phrase ← "go is fun", updated ← "Go is fun", changed ← true

    8func main() {9  var phrase→ "go is fun" = "go is fun" //@phrase="go is fast", "java is fun"10  updated→ "Go is fun" := strings.ReplaceAll(phrase"go is fun", "go", "Go")11  changed→ true := phrase"go is fun" != updated"Go is fun"1213  fmt.Println("phrase=", phrase"go is fun")14  fmt.Println("updated=", updated"Go is fun")15  fmt.Println("changed=", changedtrue)16}
    outputphrase= go is fun
updated= Go is fun
changed= true

  1. phrase ← "go is fast", updated ← "Go is fast", changed ← true

    8func main() {9  var phrase→ "go is fast" = "go is fast"10  updated→ "Go is fast" := strings.ReplaceAll(phrase"go is fast", "go", "Go")11  changed→ true := phrase"go is fast" != updated"Go is fast"1213  fmt.Println("phrase=", phrase"go is fast")14  fmt.Println("updated=", updated"Go is fast")15  fmt.Println("changed=", changedtrue)16}
    outputphrase= go is fast
updated= Go is fast
changed= true

  1. phrase ← "java is fun", updated ← "java is fun", changed ← false

    8func main() {9  var phrase→ "java is fun" = "java is fun"10  updated→ "java is fun" := strings.ReplaceAll(phrase"java is fun", "go", "Go")11  changed→ false := phrase"java is fun" != updated"java is fun"1213  fmt.Println("phrase=", phrase"java is fun")14  fmt.Println("updated=", updated"java is fun")15  fmt.Println("changed=", changedfalse)16}
    outputphrase= java is fun
updated= java is fun
changed= false