How to extract all regular expression matches from string with Go language?

In this tutorial, we will create a program in Go language to extract all matching regular expression from a provided string. We are going to use standard packages from Go languages library;

Import required packages (Golang):

• fmt - Implement formatted input output in Go.
• regexp - This package allows us to search using regular expressions.

 package main import (	"fmt"	"regexp" )

Extract regex from string

Let's declare a variable containing the string to extract regex from.

 func main() {	str := "echo $((1+2)) $((?)))" }

Now, we can use the regex package with MustCompile() function to define a regular expression. (assign a varible for further use and easy reading)

 re := regexp.MustCompile(`\$\(\((.*?)\)\)`)

To extract all regular expression matches from a string a store that into a list varible use FindAllStringSubmatch(string. int) with the assign variable.

 command := re.FindAllStringSubmatch(str, -1)

We can use a for loop to go through all matched patterns.

 for i := range command { fmt.Println("Match found :", command[i][1]) }

Take a look at the final code:

 package main import (	"fmt"	"regexp" ) func main() {	str := "echo $((1+2)) $((?)))"	re := regexp.MustCompile(`\$\(\((.*?)\)\)`)	command := re.FindAllStringSubmatch(str, -1)	for i := range command {	fmt.Println("Message :", command[i][1])	} }