使用Java中的正则表达式匹配字符串中的元音的程序
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]
例子1
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
例子2
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