“ |” 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
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"); } } }
Enter your input: 9848033228 9848033228 is valid
Enter your input: an apple a day keeps doctor away an apple a day keeps doctor away is valid
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 { . . . . . . . . . . . . . . . } }
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"); } } } }
Enter your input: 9848033228 For regex \d{10} 9848033228 is valid For regex ^[aeiou] 9848033228 is not valid
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