您可以将所有必需的字符分组,以在方括号“ [] ”内进行匹配,即,元字符/子表达式“ [] ”与所有指定的字符匹配。因此,要匹配所有字母,请在其中指定元音字母,如下所示-
[aeiouAEIOU]
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class MatchVowels { public static void main( String args[] ) { String regex = "[aeiouAEIOU]"; System.out.println("Enter input string: "); Scanner sc = new Scanner(System.in); String input = sc.nextLine(); //编译正则表达式 Pattern.compile(regex); //编译正则表达式 Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(input); if(matcher.find()) { System.out.println("The input string contains vowels"); } else { System.out.println("The input string does not contain vowels"); } } }
输出结果
Enter input string: hello how are you welcome The input string contains vowels
import java.util.Scanner; public class Test { public static void main( String args[] ) { String regex = "[aeiouAEIOU]"; System.out.println("Enter input string: "); Scanner sc = new Scanner(System.in); String input = sc.nextLine(); boolean result = input.matches(regex); if(result) { System.out.println("The input string contains vowels"); } else { System.out.println("The input string does not contain vowels"); } } }
输出结果
Enter input string: hello how are you welcome The input string does not contain vowels