数据结构
网络
RDBMS
操作系统
Java
MS Excel
iOS
HTML
CSS
Android
Python
C 编程
C++
C#
MongoDB
MySQL
Javascript
PHP
物理学
化学
生物学
数学
英语
经济学
心理学
社会学
时装学
法律如何用 Java 检查输入中的多个正则表达式？
“|” 元字符：Java 正则表达式中的元字符 “|” 允许你匹配多个正则表达式，比如，如果你需要用多个表达式匹配某段输入文本，你需要用它将它们分隔开，比如
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();
//Regular expression
String regex = "\d{10}|^[aeiou]";
//Creating a pattern object
Pattern pattern = Pattern.compile(regex);
//Creating a Matcher object
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模式对象编译所有正则表达式，并将它们添加到一个列表对象中，然后在输入文本中查找匹配项，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();
//Regular expressions
String regex1 = "\d{10}";
String regex2 = "^[aeiou]";
//Creating a pattern objects
Pattern pattern1 = Pattern.compile(regex1);
Pattern pattern2 = Pattern.compile(regex2);
//Creating an List object
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
更新于： 2020 年 1 月 10 日
5K+ 浏览
广告