Java 中的正则表达式“.”(点)元字符
子表达式/元字符“.”匹配除了换行符之外的任何单个字符。
示例 1
import java.util.regex.Matcher; import java.util.regex.Pattern; public class MatchesAll { public static void main( String args[] ) { String regex = "."; 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); } }
输出
Number of matches: 40
示例 2
以下 Java 程序接受用户输入的 5 个字符串,并打印以 e 结尾的四字母单词。
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 = "...e"; 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("four letter words that ends with e: "); for(int i=0; i<5;i++) { //Creating a Matcher object Matcher m = p.matcher(input[i]); if(m.matches()) { System.out.println(m.group()); } } } }
输出
Enter 5 input strings: hive sample wife life naive four letter words that ends with e: hive wife life
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