Given some Strings as Email addresses, the task is to extract the domain name from it
Examples:
Input: test_str = ‘team@geeksforgeeks.org’
Output: geeksforgeeks.org
Explanation: Domain name, geeksforgeeks.org extracted.
Input: test_str = ‘abcd@gmail.com’
Output: gmail.com
Explanation: Domain name, gmail.com extracted.
Approach
Method 1: Using the String split() method
This problem can be solved using the Java String split method.
Syntax: Public String [] split (String regex)
Where, regex: a delimiting regular expression
Returns: An array of strings is computed by splitting the given string.
Exception Thrown: PatternSyntaxException – if the provided regular expression’s syntax is invalid.
Below is the code implementation of the above-discussed approach:
Java
public class GFG { static String splitDomainName(String str, String delimeter) { String finalOutput = ""; String arrayOfStr[] = str.split(delimeter); if (arrayOfStr.length == 2) { finalOutput = arrayOfStr[1]; } return finalOutput; } public static void main(String args[]) { // Enter the Email as String String str = "team@geeksforgeeks.org"; // deleimeter String deleimeter = "@"; System.out.println("The original string is :" + str); System.out.println( "The extracted domain name :" + splitDomainName(str, deleimeter)); }} |
The original string is :team@geeksforgeeks.org The extracted domain name :geeksforgeeks.org
Method 2: Using substring() Method of String Class
Syntax: public String substring(int beginningIndex)
Where, beginningIndex: Starting index of the substring
Return Type: String
Note: If endIndex is not given as a parameter then Str.length()-1 will be the end string
Below is the code implementation of the above-discussed approach:
Java
public class GFG { static String str1 = ""; static String getEmailDomain(String str) { str1 = str.substring(str.indexOf("@") + 1); return str1; } public static void main(String args[]) { String str = "team@geeksforgeeks.org"; System.out.println("The original string is :" + str); System.out.println("The extracted domain name :" + getEmailDomain(str)); }} |
The original string is :team@geeksforgeeks.org The extracted domain name :geeksforgeeks.org
Method 3: Using StringUtils.substringAfter() from Apache Commons Lang
StringUtils is a class that is used to handle String and operations performed in the string, it provides more utility methods than the Java String class. This class does not belong to the Java package; instead, it belongs to the Apache Commons Library.
import org.apache.commons.lang3.StringUtils;
Write it in the written class source code to use all the functionality. Add the following dependency for Apache Commons Library in the maven project pom.xml file
<dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.12.0</version> </dependency>
Below is the code implementation of the above-discussed approach:
Java
import org.apache.commons.lang3.StringUtils; public class GFG { static String str1 = ""; static String getDomainNameEmail(String str) { str1 = StringUtils.substringAfter(str, "@"); return str1; } public static void main(String args[]) { String str = "team@geeksforgeeks.org"; System.out.println("The original string is :" + str); System.out.println("The extracted domain name :" + getDomainNameEmail(str)); }} // This online compiler does not support StringUtils// for running this program ,Its dependency must be put into// the// maven project pom.xml file |
Output:
The original string is :team@geeksforgeeks.org The extracted domain name :geeksforgeeks.org
