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子表达式/元字符“ \ W ”与非单词字符匹配。
import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main(String args[]) { String regex = "\\W!"; String input = "您好,欢迎来到w3codebox!"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count++; } System.out.println("Number of matches: "+count); } }
Output result
Number of matches: 1
The following example reads 5 string values and prints the values containing non-word characters-
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main( String args[] ) { String regex = "\\W.*$"; 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(); } // Create a Pattern object Pattern p = Pattern.compile(regex); System.out.println("Strings that contain non-word characters:"); for(int i = 0; i < 5; i++) { // Create a Matcher object Matcher m = p.matcher(input[i]); if(m.matches()) { System.out.println(m.group()); } } } }
Output result
Enter 5 input strings: $hello sample test1 test2 #$&* Strings that contain non-word characters: $hello #$&*