用于表示一个大于 10 的十六进制数字且长度必须为偶数的 Java 正则表达式。
以下是匹配大于 10 且长度为偶数的十六进制数字的正则表达式 -
^(?=.{10,255}$)(?:0x)?\p{XDigit}{2}(?:\p{XDigit}{2})*$
其中,
^ - 匹配句子的开头。
(?=.{10,255}$) - 以 10 到 255 个字符结尾的字符串。
\p{XDigit}{2} - 两个十六进制字符。
(?:\p{XDigit}{2})* - 0 个或多个双十六进制字符序列。
$ - 匹配句子的结尾。
范例 1
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class JavaExample51 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); String nums[] = new String[5]; for(int i=0; i<nums.length; i++){ System.out.println("Enter a hexa-decimal number: "); nums[i] = sc.nextLine(); } //Regular expression to accept English alphabet String regex = "^(?=.{10,255}$)(?:0x)?\p{XDigit}{2}(?:\p{XDigit}{2})*$"; //Creating a pattern object Pattern pattern = Pattern.compile(regex); for (String hex : nums) { //Creating a Matcher object Matcher matcher = pattern.matcher(hex); if(matcher.find()) { System.out.println(hex+" is valid"); }else { System.out.println(hex+" is not valid"); } } } }
输出
Enter a hexa-decimal number: 0x1234567890 Enter a hexa-decimal number: 123456789 Enter a hexa-decimal number: 123456789012 Enter a hexa-decimal number: sfdgdf35364 Enter a hexa-decimal number: $@%#BV#* 0x1234567890 is valid 123456789 is not valid 123456789012 is valid sfdgdf35364 is not valid $@%#BV#* is not valid
范例 2
import java.util.Scanner; public class JavaExample { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enter a hexa-decimal number: "); String name = sc.nextLine(); String regex = "^(?=.{10,255}$)(?:0x)?\p{XDigit}{2}(?:\p{XDigit}{2})*$"; boolean result = name.matches(regex); if(result) { System.out.println("Given number is valid"); }else { System.out.println("Given number is not valid"); } } }
输出 1
Enter your name: 0x1234567890 Given name is valid
输出 2
Enter a hexa-decimal number: 024587545 Given number is not valid
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