Regular expression email pattern
^[_A-Za-z0-9-\+]+(\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\.[A-Za-z0-9]+)*(\.[A-Za-z]{2,})$ |
^[_A-Za-z0-9-\+]+(\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\.[A-Za-z0-9]+)*(\.[A-Za-z]{2,})$
This regular expression refers to a pattern which must start with “_A-Za-z0-9-\+” , optional follow by “.[_A-Za-z0-9-]”, and end with a “@” symbol. The email’s domain name must start with “A-Za-z0-9-“, follow by first level Tld (.com, .net) “.[A-Za-z0-9]” and optional follow by a second level Tld (.com.au, .com.my) “\.[A-Za-z]{2,}”, where second level Tld must start with a dot “.” and length must equal or more than 2 characters.
Example
package com.w3schools;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexTest {
private static final String PATTERN =
"^[_A-Za-z0-9-\+]+(\.[_A-Za-z0-9-]+)*@"
+ "[A-Za-z0-9-]+(\.[A-Za-z0-9]+)*(\.[A-Za-z]{2,})$";
public static void main(String args[]){
List<String> values = new ArrayList<String>();
values.add("[email protected]");
values.add("[email protected]");
values.add("[email protected]");
values.add("[email protected]");
Pattern pattern = Pattern.compile(PATTERN);
for (String value : values){
Matcher matcher = pattern.matcher(value);
if(matcher.matches()){
System.out.println("Email "+ value +" is valid");
}else{
System.out.println("Email "+ value +" is invalid");
}
}
}
} |
package com.w3schools;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexTest {
private static final String PATTERN =
"^[_A-Za-z0-9-\+]+(\.[_A-Za-z0-9-]+)*@"
+ "[A-Za-z0-9-]+(\.[A-Za-z0-9]+)*(\.[A-Za-z]{2,})$";
public static void main(String args[]){
List<String> values = new ArrayList<String>();
values.add("[email protected]");
values.add("[email protected]");
values.add("[email protected]");
values.add("[email protected]");
Pattern pattern = Pattern.compile(PATTERN);
for (String value : values){
Matcher matcher = pattern.matcher(value);
if(matcher.matches()){
System.out.println("Email "+ value +" is valid");
}else{
System.out.println("Email "+ value +" is invalid");
}
}
}
}
Output