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Scala program to demonstrate the replaceFirst() method

Here, we are going to demonstrate the replaceFirst() method in Scala programming language.
Submitted by Nidhi, on May 23, 2021 [Last updated : March 10, 2023]

Scala – String.replaceFirst() Method

Here, we will create a string and then replace the first substring matching the regular expression using the replaceFirst() method. After that, we will print the result on the console screen.

Scala code to demonstrate the example of String.replaceFirst() method

The source code to demonstrate the replaceFirst() method is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

// Scala program to demonstrate
// the replaceFirst() method

object Sample {
  def main(args: Array[String]) {
    var str: String = "MAN WAN LAN PAN NEWTWORK";
    var res: String = "";

    res = str.replaceFirst(".AN", "##");
    printf("Result:\n%s\n", res);
  }
}

Output

Result:
## WAN LAN PAN NEWTWORK

Explanation

In the above program, we used an object-oriented approach to create the program. And, we created an object Sample. Here, we defined main() function. The main() function is the entry point for the program.

In the main() function, we created a string variable str initialized with "MAN WAN LAN PAN NETWORK". Then we replaced the first substring with "##", matching specified regular expression in the replaceFirst() method and assigned the result into res variable, and then printed the result on the console screen.

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