The String.replaceFirst(String regex, String replacement) method replaces the first substring of this string that matches the given regular expression with the given replacement.
Java String.replaceFirst() Method Example
This is a complete example to demonstrate the usage of replaceFirst() methods.
public class ReplaceExample {
public static void main(String[] args) {
String str = "javaguides";
String subStr = str.replaceFirst("[a-z]", "java");
System.out.println(subStr);
}
}
Output:
javaavaguides
Reference
Free Spring Boot Tutorial - 5 Hours Full Course
Watch this course on YouTube at Spring Boot Tutorial | Fee 5 Hours Full Course