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How to split a slice of bytes after the given separator in Golang?
  • Last Updated : 26 Aug, 2019
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In Go language slice is more powerful, flexible, convenient than an array, and is a lightweight data structure. The slice is a variable-length sequence which stores elements of a similar type, you are not allowed to store different type of elements in the same slice.
In the Go slice of bytes, you are allowed to split the slice after the specified separator using a SplitAfter() function. This function splits a slice of bytes into all subslices after each instance of the given separator and returns a slice which contains these subslices. It is defined under the bytes package so, you have to import bytes package in your program for accessing SplitAfter function.

Syntax:

func SplitAfter(o_slice, sep []byte) [][]byte

Here, o_slice is the slice of bytes and sep is the separator. If the sep is empty, then it will split after each UTF-8 sequence. Let us discuss this concept with the help of the given examples:

Example 1:




// Go program to illustrate the concept
// of splitting a slice of bytes
package main
  
import (
    "bytes"
    "fmt"
)
  
func main() {
  
    // Creating and Splitting 
    // the slice of bytes
    // Using SplitAfter function
    res1 := bytes.SplitAfter([]byte("****Welcome, to, GeeksforGeeks****"),
                                                             []byte(","))
      
    res2 := bytes.SplitAfter([]byte("Learning x how x to x trim x a x slice of bytes"),
                                                                          []byte("x"))
      
    res3 := bytes.SplitAfter([]byte("GeeksforGeeks, Geek"), []byte(""))
      
    res4 := bytes.SplitAfter([]byte(""), []byte(","))
  
    // 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)
}

Output:



Final Result after splitting:

Slice 1: [****Welcome,  to,  GeeksforGeeks****]
Slice 2: [Learning x  how x  to x  trim x  a x  slice of bytes]
Slice 3: [G e e k s f o r G e e k s ,   G e e k]
Slice 4: []

Example 2:




// Go program to illustrate the concept
// of splitting a slice of bytes
package main
  
import (
    "bytes"
    "fmt"
)
  
func main() {
  
    // Creating and initializing
    // the slice of bytes
    // Using shorthand declaration
    slice_1 := []byte{'!', '!', 'G', 'e', 'e', 'k', 's', 'f',
                 'o', 'r', 'G', 'e', 'e', 'k', 's', '#', '#'}
      
    slice_2 := []byte{'A', 'p', 'p', 'l', 'e'}
      
    slice_3 := []byte{'%', 'g', '%', 'e', '%'
                 'e', '%', 'k', '%', 's', '%'}
  
    // Displaying slices
    fmt.Println("Original Slice:")
    fmt.Printf("Slice 1: %s", slice_1)
    fmt.Printf("\nSlice 2: %s", slice_2)
    fmt.Printf("\nSlice 3: %s", slice_3)
  
    // Splitting the slice of bytes
    // Using SplitAfter function
    res1 := bytes.SplitAfter(slice_1, []byte("eek"))
    res2 := bytes.SplitAfter(slice_2, []byte(""))
    res3 := bytes.SplitAfter(slice_3, []byte("%"))
  
    // Display the results
    fmt.Printf("\n\nAfter splitting:\n")
    fmt.Printf("\nSlice 1: %s", res1)
    fmt.Printf("\nSlice 2: %s", res2)
    fmt.Printf("\nSlice 3: %s", res3)
  
}

Output:

Original Slice:
Slice 1: !!GeeksforGeeks##
Slice 2: Apple
Slice 3: %g%e%e%k%s%

After splitting:

Slice 1: [!!Geek sforGeek s##]
Slice 2: [A p p l e]
Slice 3: [% g% e% e% k% s% ]

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