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public String replaceFirst(String regex,
                           String replacement)

public class Test {
    public static void main(String args[]) {
        String Str = new String("hello tutorialpro, I am from tutorialpro.");

        System.out.print("Return Value :" );
        System.out.println(Str.replaceFirst("tutorialpro", "google" ));
        System.out.print("Return Value :" );
        System.out.println(Str.replaceFirst("(.*)tutorialpro(.*)", "google" ));
    }
}

Return Value :hello google, I am from tutorialpro.
Return Value :google