Scala String replaceFirst() method with example

The replaceFirst() method is same as replaceAll but here only the first appearance of the stated sub-string will be replaced.

Method Definition: String replaceFirst(String regex, String replacement)
Return Type: It returns the stated string after replacing the first appearance of stated regular expression with the string we provide.

Example #1:

// Scala program of replaceFirst()
// method

// Creating object
object GfG
{

    // Main method
    def main(args:Array[String])
    {

        // Applying replaceFirst method
        val result = "csoNidhimsoSingh".replaceFirst(".so", "##")

        // Displays output
        println(result)

    }
}

Output:

##NidhimsoSingh

Example #2:

// Scala program of replaceFirst()
// method

// Creating object
object GfG
{

    // Main method
    def main(args:Array[String])
    {

        // Applying replaceFirst method
        val result = "NidhimsoSinghcso".replaceFirst(".so", "*")

        // Displays output
        println(result)

    }
}

Output:

Nidhi*Singhcso

Example #3:

// Scala program of replaceFirst()
// method

// Creating object
object GfG
{

    // Main method
    def main(args:Array[String])
    {

        // Applying replaceFirst method
        val result = "fsoNidhimsoSinghcso".replaceFirst(".so", "*")

        // Displays output
        println(result)

    }
}

Output:

*NidhimsoSinghcso