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Golang program to check a specified string is started with a given character using regular expression

Here, we are going to learn how to check a specified string is started with a given character using regular expression in Golang (Go Language)?
Submitted by Nidhi, on April 13, 2021 [Last updated : March 04, 2023]

Checking a specified string is started with a given character using regular expression in Golang

Problem Solution:

In this program, we will read a string from the user and check entered string is started with the character 'M'. After that, print the appropriate message on the console screen.

Program/Source Code:

The source code to check a specified string is started with a given character using regular expression is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

Golang code to check a specified string is started with a given character using regular expression

// Golang program to check a specified string is started
// with a given character using regular expression

package main

import "fmt"
import "regexp"

func main() {
	var str string

	fmt.Printf("Enter string: ")
	fmt.Scanf("%s", &str)

	result, _ := regexp.MatchString("M([a-z]+)*", str)

	if result == true {
		fmt.Printf("String '%s' started with charter M\n", str)
	} else {
		fmt.Printf("String '%s' is not started with charter M\n", str)
	}
}

Output:

Enter string: Monk123
String 'Monk123' started with charter M

Explanation:

In the above program, we declare the package main. The main package is used to tell the Go language compiler that the package must be compiled and produced the executable file. Here, we imported the fmt,  regexp packages then we can use a function related to the fmt and regexp package.

In the main() function, we created a string variable str and then read the value of str from the user and check entered string is started with the character 'M' using regexp.MatchString() function. The regexp.MatchString() function returns the Boolean value. After that, we printed the appropriate message based on the return value of the regexp.MatchString() function on the console screen.

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