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Golang | Splitting the string after the specified separator
  • Last Updated : 05 Sep, 2019
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In Go language, strings are different from other languages like Java, C++, Python, etc. It is a sequence of variable-width characters where each and every character is represented by one or more bytes using UTF-8 Encoding.
In the Go strings, you are allowed to split the string after the specified separator using a SplitN() function. This function splits a slice into all substrings after each instance of the given separator and returns a slice of the substrings between those separators. The count indicates the number of subslices to return. It is defined under the string package so, you have to import string package in your program for accessing SplitN function.


func SplitN(str, sep string, m int) []string

Here, str is the string and sep is the separator. If str does not contain the given sep and sep is non-empty, then it will return a slice of length 1 which contain only str. Or if the sep is empty, then it will split after each UTF-8 sequence. Or if both str and sep are empty, then it will return an empty slice.

Example 1:

// Go program to illustrate the concept
// of splitting a string
package main
import (
func main() {
    // Creating and Splitting a string
    // Using SplitN function
    res1 := strings.SplitN("****Welcome, to, GeeksforGeeks****", ",", -1)
    res2 := strings.SplitN("Learning x how x to x trim"+
                       " x a x slice of bytes", "x", 3)
    res3 := strings.SplitN("Geeks,for,Geeks, Geek", ",", 0)
    res4 := strings.SplitN("", ",", 2)
    // Display the results
    fmt.Printf("\nFinal Result after splitting:\n")
    fmt.Printf("\nSlice 1: %s", res1)
    fmt.Printf("\nSlice 2: %s", res2)
    fmt.Printf("\nSlice 3: %s", res3)
    fmt.Printf("\nSlice 4: %s", res4)


Final Result after splitting:

Slice 1: [****Welcome  to  GeeksforGeeks****]
Slice 2: [Learning   how   to x trim x a x slice of bytes]
Slice 3: []
Slice 4: []

Example 2:

// Go program to illustrate the concept
// of splitting the string
package main
import (
func main() {
    // Creating and initializing a string
    // Using shorthand declaration
    string_1 := "Welcome, to, Geeks, for, Geeks"
    string_2 := "AppleAppleAppleAppleAppleApple"
    string_3 := "%G%E%E%K%sS"
    // Displaying strings
    fmt.Println("Original Strings:")
    fmt.Printf("String 1: %s", string_1)
    fmt.Printf("\nString 2: %s", string_2)
    fmt.Printf("\nString 3: %s", string_3)
    // Splitting the given strings
    // Using SplitN function
    res1 := strings.SplitN(string_1, ",", 2)
    res2 := strings.SplitN(string_2, "pp", 3)
    res3 := strings.SplitN(string_3, "%", 0)
    // Display the results
    fmt.Printf("\n\nAfter splitting:\n")
    fmt.Printf("\nString 1: %s", res1)
    fmt.Printf("\nString 2: %s", res2)
    fmt.Printf("\nString 3: %s", res3)


Original Strings:
String 1: Welcome, to, Geeks, for, Geeks
String 2: AppleAppleAppleAppleAppleApple
String 3: %G%E%E%K%sS

After splitting:

String 1: [Welcome  to, Geeks, for, Geeks]
String 2: [A leA leAppleAppleAppleApple]
String 3: []

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