正規表現で16進カラーコードを検証する方法
16進カラーコードの正規表現パターン
^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$
説明
^ #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
全体の組み合わせは、文字列は「＃」記号で始まり、「a」から「f」、「A」から「Z」までの文字、または「0」から「9」までの数字が正確に6または3でなければならないことを意味します長さ。 この正規表現パターンは、16進Webカラーコードチェックに非常に役立ちます。
Java正規表現の例
package com.example.regex;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class HexValidator{
private Pattern pattern;
private Matcher matcher;
private static final String HEX_PATTERN = "^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$";
public HexValidator(){
pattern = Pattern.compile(HEX_PATTERN);
}
/**
* Validate hex with regular expression
* @param hex hex for validation
* @return true valid hex, false invalid hex
*/
public boolean validate(final String hex){
matcher = pattern.matcher(hex);
return matcher.matches();
}
}
一致する16進コード：
1. 「＃1f1f1F」、「＃AFAFAF」、「＃1AFFa1」、「＃222fff」、「＃F00」、「＃F00」
一致しない16進コード：
1. 「123456」–「” symbol
2. “#afafah” – “h” is not allow, valid letter from “a” to “f”
3. “#123abce” – either 6 length or 3 length
4. “aFaE3f” – must start with a “」記号で始まる必要があります。長さは6または長さは3
5です。 “F00” – must start with a “#” symbol
6. “#afaf” – either 6 length or 3 length
7. “#F0h” – “h” is not allow, valid letter from “a” to “f”
単体テスト– HexValidator
package com.example.regex;
import org.testng.Assert;
import org.testng.annotations.*;
/**
* Hex validator Testing
* @author example
*
*/
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);
}
}
}
単体テスト-結果
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
PASSED: ValidHexTest([Ljava.lang.String;@1a626f)
PASSED: InValidHexTest([Ljava.lang.String;@e5855a)
===============================================
com.example.regex.HexValidatorTest
Tests run: 2, Failures: 0, Skips: 0
===============================================
===============================================
example
Total tests run: 2, Failures: 0, Skips: 0
===============================================