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正则表达式教程:匹配火车车次
前端
2024-02-28 08:00:00
一、正则解释
正则表达式:
/^[GCDZTSPKXLY1-9]d{1,4}$/
含义:
- ^: 匹配字符串开头
- [GCDZTSPKXLY1-9]: 匹配火车车次前缀,可以是
G
、D
、Z
、T
、S
、P
、K
、X
、L
、Y
或数字1-9
- d{1,4}: 匹配 1 到 4 位数字
- $: 匹配字符串结尾
示例:
该正则表达式可以匹配以下火车车次:
G1868
D102
D9
Z5
Z24
Z17
二、使用场景
该正则表达式主要用于匹配火车车次,例如:
- 验证用户输入的车次是否合法
- 从文本中提取火车车次信息
- 对火车车次进行分类和整理
三、代码示例
JavaScript
const regex = /^[GCDZTSPKXLY1-9]d{1,4}$/;
console.log(regex.test("G1868")); // true
console.log(regex.test("D102")); // true
console.log(regex.test("D9")); // true
console.log(regex.test("Z5")); // true
console.log(regex.test("Z24")); // true
console.log(regex.test("Z17")); // true
console.log(regex.test("X10")); // true
Java
import java.util.regex.Pattern;
public class TrainNumberValidation {
public static boolean isValidTrainNumber(String trainNumber) {
Pattern pattern = Pattern.compile("^[GCDZTSPKXLY1-9]d{1,4}import java.util.regex.Pattern;
public class TrainNumberValidation {
public static boolean isValidTrainNumber(String trainNumber) {
Pattern pattern = Pattern.compile("^[GCDZTSPKXLY1-9]d{1,4}$");
return pattern.matcher(trainNumber).matches();
}
public static void main(String[] args) {
System.out.println(isValidTrainNumber("G1868")); // true
System.out.println(isValidTrainNumber("D102")); // true
System.out.println(isValidTrainNumber("D9")); // true
System.out.println(isValidTrainNumber("Z5")); // true
System.out.println(isValidTrainNumber("Z24")); // true
System.out.println(isValidTrainNumber("Z17")); // true
System.out.println(isValidTrainNumber("X10")); // true
}
}
quot;);
return pattern.matcher(trainNumber).matches();
}
public static void main(String[] args) {
System.out.println(isValidTrainNumber("G1868")); // true
System.out.println(isValidTrainNumber("D102")); // true
System.out.println(isValidTrainNumber("D9")); // true
System.out.println(isValidTrainNumber("Z5")); // true
System.out.println(isValidTrainNumber("Z24")); // true
System.out.println(isValidTrainNumber("Z17")); // true
System.out.println(isValidTrainNumber("X10")); // true
}
}
Python
import re
def is_valid_train_number(train_number):
pattern = r"^[GCDZTSPKXLY1-9]d{1,4}import re
def is_valid_train_number(train_number):
pattern = r"^[GCDZTSPKXLY1-9]d{1,4}$"
return re.match(pattern, train_number)
print(is_valid_train_number("G1868")) # True
print(is_valid_train_number("D102")) # True
print(is_valid_train_number("D9")) # True
print(is_valid_train_number("Z5")) # True
print(is_valid_train_number("Z24")) # True
print(is_valid_train_number("Z17")) # True
print(is_valid_train_number("X10")) # True
quot;
return re.match(pattern, train_number)
print(is_valid_train_number("G1868")) # True
print(is_valid_train_number("D102")) # True
print(is_valid_train_number("D9")) # True
print(is_valid_train_number("Z5")) # True
print(is_valid_train_number("Z24")) # True
print(is_valid_train_number("Z17")) # True
print(is_valid_train_number("X10")) # True
PHP
<?php
$regex = "/^[GCDZTSPKXLY1-9]d{1,4}$/";
echo preg_match($regex, "G1868") . "\n"; // 1
echo preg_match($regex, "D102") . "\n"; // 1
echo preg_match($regex, "D9") . "\n"; // 1
echo preg_match($regex, "Z5") . "\n"; // 1
echo preg_match($regex, "Z24") . "\n"; // 1
echo preg_match($regex, "Z17") . "\n"; // 1
echo preg_match($regex, "X10") . "\n"; // 1
?>