Chuỗi xác thực mã màu hex
^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$
Description
^ # start of the line
# # must constains a"#"symbols
(# start of group #1
[A-Fa-f0-9]{6}# bất kì kí tự a-z,A-Z,0-9,with length of6
| # or
[A-Fa-f0-9]{3}# bất kì kí tự a-z,A-Z,0-9,with length of3
)# end of group #1
$ # end of the line
Code:
package com.codewr.javacore.regular.expression;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
*
* @author codewr
*/
public class HexValidator {
/**
* ^ #start of the line
* # # must constains a "#" symbols
* ( # start of group #1
* [A-Fa-f0-9]{6} # any strings in the list, with length of 6
* | # ..or
* [A-Fa-f0-9]{3} # any strings in the list, with length of 3
* ) # end of group #1
* $ #end of the line
*/
private static final String HEX_PATTERN = "^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$";
public static void main(String[] args) {
HexValidator hexValidator = new HexValidator();
//check hex color validate
boolean isValid = hexValidator.validate("#aff");
System.out.println("hex color valid is " + isValid);
}
/**
* Validate hex color with regular expression
*
* @param hex hex color for validation
* @return true valid hex color, false invalid hex color
*/
public boolean validate(final String hex) {
Pattern pattern = Pattern.compile(HEX_PATTERN);
Matcher matcher = pattern.matcher(hex);
return matcher.matches();
}
}
Code UnitTest:
- “#1f1f1F”, “#AFAFAF”,”#1AFFa1″,”#222fff”, “#F00”, “#F00” : valid hex color
- “123456”: invalid– must start with a “#” symbol
- “#afafah” : invalid – “h” is not allow, valid letter from “a” to “f”
- “#123abce” : invalid – either 6 length or 3 length
- “aFaE3f”: invalid – must start with a “#” symbol, either 6 length or 3 length
- “F00”: invalid – must start with a “#” symbol
- “#afaf”: invalid – either 6 length or 3 length
- “#F0h” : invalid – “h” is not allow, valid letter from “a” to “f”
import com.codewr.javacore.regular.expression.HexValidator;
import org.testng.Assert;
import org.testng.annotations.*;
/**
* Hex validator Testing
* @author codewr
*
*/
public class HexValidatorTest {
private HexValidator hexValidator;
@BeforeClass
public void initData(){
hexValidator = new HexValidator();
}
@DataProvider
public Object[][] ValidHexProvider() {
return new Object[][]{
{new String[] {
"#1f1f1F", "#AFAFAF","#1AFFa1","#222fff", "#F00"
}}
};
}
@DataProvider
public Object[][] InvalidHexProvider() {
return new Object[][]{
{new String[] {
"123456","#afafah","#123abce","aFaE3f",
"F00","#afaf", "#F0h"
}}
};
}
@Test(dataProvider = "ValidHexProvider")
public void ValidHexTest(String[] hex) {
for(String temp : hex){
boolean valid = hexValidator.validate(temp);
System.out.println("Hex is valid : " + temp + " , " + valid);
Assert.assertEquals(true, valid);
}
}
@Test(dataProvider = "InvalidHexProvider", dependsOnMethods="ValidHexTest")
public void InValidHexTest(String[] hex) {
for(String temp : hex){
boolean valid = hexValidator.validate(temp);
System.out.println("Hex is valid : " + temp + " , " + valid);
Assert.assertEquals(false, valid);
}
}
}
Output:
Running HexValidatorTest
Hex is valid : #1f1f1F , true
Hex is valid : #AFAFAF , true
Hex is valid : #1AFFa1 , true
Hex is valid : #222fff , true
Hex is valid : #F00 , true
Hex is valid : 123456 , false
Hex is valid : #afafah , false
Hex is valid : #123abce , false
Hex is valid : aFaE3f , false
Hex is valid : F00 , false
Hex is valid : #afaf , false
Hex is valid : #F0h , false
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.404 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>