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Golang | Splitting the slice after the specified separator

  • Last Updated : 06 Sep, 2019

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 SplitAfterN() function. This function splits a slice into all subslices after each instance of the given separator and returns a slice which contains these subslices. If the given separator is empty, then it splits after each UTF-8 sequence and the count indicates the number of subslices to return. It is defined under the bytes package so, you have to import bytes package in your program for accessing SplitAfterN function.

Syntax:

func SplitAfterN(o_slice, sep []byte, m int) [][]byte

Here, o_slice is the original string, sep is the separator, and m is used to find the number of substrings to return. Here, if m>0, then it returns at most m subslices and the last string subslice will not split. If m == 0, then it will return nil. If m<0, then it will return all subslices. 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 SplitAfterN function 
    res1 := bytes.SplitAfterN([]byte("****Welcome, to, GeeksforGeeks****"), 
                                                           []byte(","), -1) 
         
    res2 := bytes.SplitAfterN([]byte("Learning x how x to x "+
                 "trim x a x slice of bytes"), []byte("x"), 3) 
         
    res3 := bytes.SplitAfterN([]byte("Geeks,for,Geeks, Geek"), []byte(","), 0) 
         
    res4 := bytes.SplitAfterN([]byte(""), []byte(","), 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) 

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: []
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', 'G', 'e', 'e', 'k', 's', '#', '#'
         
    slice_2 := []byte{'A', 'p', 'p','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 SplitAfterN function 
    res1 := bytes.SplitAfterN(slice_1, []byte("eek"), 2) 
    res2 := bytes.SplitAfterN(slice_2, []byte(""), 3) 
    res3 := bytes.SplitAfterN(slice_3, []byte("%"), 0) 
     
    // 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: !!GeeksforGeeksGeeks##
Slice 2: Apppple
Slice 3: %g%e%e%k%s%

After splitting:

Slice 1: [!!Geek sforGeeksGeeks##]
Slice 2: [A p ppple]
Slice 3: []



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