Chuỗi xác thực địa chỉ email
^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*
@[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$
Description
^ #start of the line
[_A-Za-z0-9-\\+]+# must start with string in the bracket[],must contains one or more(+)
(# start of group #1
\\.[_A-Za-z0-9-]+# follow by a dot"."and string in the bracket[],must contains one or more(+)
)*# end of group #1,thisgroup is optional(*)
@ # must contains a"@"symbol
[A-Za-z0-9-]+# follow by string in the bracket[],must contains one or more(+)
(# start of group #2-first level TLD checking
\\.[A-Za-z0-9]+# follow by a dot"."and string in the bracket[],must contains one or more(+)
)*# end of group #2,thisgroup is optional(*)
(# start of group #3-second level TLD checking
\\.[A-Za-z]{2,}# follow by a dot"."and string in the bracket[],with minimum length of2
)# end of group #3
$ #end of the lineCode:
package com.codewr.javacore.regular.expression;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
*
* @author codewr
*/
public class EmailValidator {
private static final String EMAIL_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) {
EmailValidator emailValidator = new EmailValidator();
//check email validate
boolean isValid = emailValidator.validate("[email protected]");
System.out.println("email valid is " + isValid);
}
/**
* Validate email with regular expression
*
* @param email email for validation
* @return true valid email, false invalid email
*/
public boolean validate(final String email) {
Pattern pattern = Pattern.compile(EMAIL_PATTERN);
Matcher matcher = pattern.matcher(email);
return matcher.matches();
}
}
Code Unit Test:
Email hợp lệ:
1. [email protected], [email protected], [email protected]
2. [email protected], [email protected], [email protected]
3. [email protected], [email protected]
4. [email protected], [email protected]
Email không hợp lệ:
1. codewr – must contains “@” symbol
2. [email protected] – tld can not start with dot “.”
3. [email protected] – “.a” is not a valid tld, last tld must contains at least two characters
4. [email protected] – tld can not start with dot “.”
5. [email protected] – tld can not start with dot “.”
6. [email protected] – email’s first character can not start with dot “.”
7. codewr()*@gmail.com – email’s is only allow character, digit, underscore and dash
8. [email protected]%*.com – email’s tld is only allow character and digit
9. [email protected] – double dots “.” are not allow
10. [email protected] – email’s last character can not end with dot “.”
11. [email protected]@gmail.com – double “@” is not allow
12. [email protected] -email’s tld which has two characters can not contains digit
import com.codewr.javacore.regular.expression.EmailValidator;
import org.testng.Assert;
import org.testng.annotations.*;
/**
* Email validator Testing
*
* @author codewr
*
*/
public class EmailValidatorTest {
private EmailValidator emailValidator;
@BeforeClass
public void initData() {
emailValidator = new EmailValidator();
}
@DataProvider
public Object[][] ValidEmailProvider() {
return new Object[][] { { new String[] { "[email protected]",
"[email protected]", "[email protected]",
"[email protected]", "[email protected]",
"[email protected]", "[email protected]",
"[email protected]", "[email protected]",
"[email protected]" } } };
}
@DataProvider
public Object[][] InvalidEmailProvider() {
return new Object[][] { { new String[] { "codewr", "[email protected]",
"[email protected]", "[email protected]", "[email protected]",
"[email protected]", "codewr()*@gmail.com", "[email protected]%*.com",
"[email protected]", "[email protected]",
"[email protected]@gmail.com", "[email protected]" } } };
}
@Test(dataProvider = "ValidEmailProvider")
public void ValidEmailTest(String[] Email) {
for (String temp : Email) {
boolean valid = emailValidator.validate(temp);
System.out.println("Email is valid : " + temp + " , " + valid);
Assert.assertEquals(valid, true);
}
}
@Test(dataProvider = "InvalidEmailProvider", dependsOnMethods = "ValidEmailTest")
public void InValidEmailTest(String[] Email) {
for (String temp : Email) {
boolean valid = emailValidator.validate(temp);
System.out.println("Email is valid : " + temp + " , " + valid);
Assert.assertEquals(valid, false);
}
}
}
Output:
Running EmailValidatorTest
Email is valid : [email protected] , true
Email is valid : [email protected] , true
Email is valid : [email protected] , true
Email is valid : codew[email protected] , true
Email is valid : [email protected] , true
Email is valid : [email protected] , true
Email is valid : [email protected] , true
Email is valid : [email protected] , true
Email is valid : [email protected] , true
Email is valid : [email protected] , true
Email is valid : codewr , false
Email is valid : [email protected] , false
Email is valid : [email protected] , false
Email is valid : [email protected] , false
Email is valid : [email protected] , false
Email is valid : [email protected] , false
Email is valid : codewr()*@gmail.com , false
Email is valid : [email protected]%*.com , false
Email is valid : [email protected] , false
Email is valid : [email protected] , false
Email is valid : [email protected]@gmail.com , false
Email is valid : [email protected] , false
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.446 sec
Results :
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0
Chú ý: file pom.xml add maven
<dependency>
<groupId>org.testng</groupId>
<artifactId>testng</artifactId>
<version>6.8</version>
<scope>test</scope>
</dependency>