如何使用Java RegEx匹配两个给定表达式之一？
使用或逻辑运算符|您可以匹配两个给定表达式之一的Java正则表达式。
例如，如果您需要正则表达式匹配多个表达式，则可以用“|”分隔所需的表达式。
例子1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String args[]) {
//从用户读取字符串
System.out.println("Enter a String");
Scanner sc = new Scanner(System.in);
String input = sc.nextLine();
//正则表达式以匹配以hello开头或以bye结尾的字符串
String regex = "^hello|bye$";
//编译正则表达式
Pattern pattern = Pattern.compile(regex);
//检索匹配器对象
Matcher matcher = pattern.matcher(input);
if(matcher.find()) {
System.out.println("Match occurred");
} else {
System.out.println("Match not occurred");
}
}
}输出1
Enter a String hello how are you Match occurred
输出2
Enter a String This is a sample string Match not occurred
例子2
import java.util.Scanner;
public class RegexExample {
public static void main( String args[] ) {
//Regular expression to match either yes or no String regex = "yes|no";
System.out.println("Enter input value: ");
Scanner sc = new Scanner(System.in);
String input = sc.nextLine();
boolean bool = input.matches(regex);
if(bool) {
System.out.println("match occurred");
} else {
System.out.println("match not accepted");
}
}
}输出1
Enter input value: yes match occurred
输出2
Enter input value: hello match not accepted