Java 中的正則表示式 "[^...]" 結構
子表示式/元字元“[^...]”匹配不在括號內的任何單個字元。
示例 1
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 Tutorialspoint"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count++; } System.out.println("Number of matches: "+count); } }
輸出
Number of matches: 21
示例 2
以下 Java 程式接受來自使用者的 5 個字串,並列印不包含英文單詞的字串/單詞。
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(); } //Creating a Pattern object Pattern p = Pattern.compile(regex); System.out.println("strings that does not contain English alphabet: "); for(int i=0; i<5;i++) { //Creating a Matcher object Matcher m = p.matcher(input[i]); if(m.find()) { System.out.println(m.group()); } } } }
輸出
Enter 5 input strings: 1234*5 *&% sample test data23 strings that does not contain English alphabet: 1234*5 *&%
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