如何针对一个输入检查多个正则表达式模式？使用Java。
“|”meta字符：meta字符“|”Java中的正则表达式允许您匹配多个正则表达式，例如，如果您需要将一个特定的输入文本与多个表达式匹配，则需要使用以下方式将它们分开：
exp1|exp2|exp3
示例
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class SampleExample {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter your input: ");
String input = sc.nextLine();
//正则表达式
String regex = "\\d{10}|^[aeiou]";
//创建一个模式对象
Pattern pattern = Pattern.compile(regex);
//创建一个Matcher对象
Matcher matcher = pattern.matcher(input);
if(matcher.find()) {
System.out.println(input+" is valid");
}else {
System.out.println(input+" is not valid");
}
}
}输出1
Enter your input: 9848033228 9848033228 is valid
输出2
Enter your input: an apple a day keeps doctor away an apple a day keeps doctor away is valid
使用列表对象
另一个解决方案是使用单个Pattern对象编译所有正则表达式，并将它们添加到列表对象，然后在输入文本上找到匹配项，如下所示：
List list = new ArrayList<>();
list.add(Pattern.compile(regex1));
list.add(Pattern.compile(regex2));
for (Pattern pattern: list) {
Matcher matcher = pattern.matcher(input);
if(matcher.find()) {
. . . . . . . . . . . . . . .
}else {
. . . . . . . . . . . . . . .
}
}示例
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MultipleRegex {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter your input: ");
String input = sc.nextLine();
//正则表达式s
String regex1 = "\\d{10}";
String regex2 = "^[aeiou]";
//创建一个模式对象s
Pattern pattern1 = Pattern.compile(regex1);
Pattern pattern2 = Pattern.compile(regex2);
//创建一个列表对象
List<Pattern> patterns = new ArrayList<>();
patterns.add(pattern1);
patterns.add(pattern2);
for (Pattern pattern: patterns) {
Matcher matcher = pattern.matcher(input);
if(matcher.find()) {
System.out.println("For regex "+pattern.pattern()+" "+input+" is valid");
} else {
System.out.println("For regex "+pattern.pattern()+" "+input+" is not valid");
}
}
}
}输出1
Enter your input:
9848033228
For regex \d{10} 9848033228 is valid
For regex ^[aeiou] 9848033228 is not valid输出2
Enter your input:
an apple a day keeps doctor away
For regex \d{10} an apple a day keeps doctor away is not valid
For regex ^[aeiou] an apple a day keeps doctor away is valid