子表达式/元字符“ [^ ...] ”匹配任何单个字符,而不是括号。
import java.util.regex.Matcher; import java.util.regex.Pattern; public class SpecifiedCharacters { public static void main( String args[] ) { String regex = "[^hwtyoupi]"; String input = "Hi how are you welcome to Nhooo"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count++; } System.out.println("Number of matches: "+count); } }
输出结果
Number of matches: 21
以下Java程序从用户接受5个字符串,并打印不包含英文字母的字符串/单词。
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main( String args[] ) { String regex = "^.*[^a-zA-Z].*$"; Scanner sc = new Scanner(System.in); System.out.println("Enter 5 input strings: "); String input[] = new String[5]; for (int i=0; i<5; i++) { input[i] = sc.nextLine(); } //创建一个Pattern对象 Pattern p = Pattern.compile(regex); System.out.println("strings that does not contain English alphabet: "); for(int i=0; i<5;i++) { //创建一个Matcher对象 Matcher m = p.matcher(input[i]); if(m.find()) { System.out.println(m.group()); } } } }
输出结果
Enter 5 input strings: 1234*5 *&% sample test data23 strings that does not contain English alphabet: 1234*5 *&%