সাব এক্সপ্রেশন/মেটাক্যারেক্টার "রি*" পূর্ববর্তী এক্সপ্রেশনের 0 বা তার বেশি ঘটনার সাথে মেলে।
উদাহরণ 1
import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main( String args[] ) { String regex = "aabc*"; String input = "aabcabcaabcabbcaabcbcaabc"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count++; } System.out.println("Number of matches: "+count); } }
আউটপুট
Number of matches: 4
উদাহরণ 2
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class MatchAllCharacters { public static void main( String args[] ) { String regex = "(.*)?(\\d+)"; 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 containing digits: "); 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()); } } } }
আউটপুট
test data hello how are you 335 welcome to Tutorialspoint Strings containing digits: sample text 1 hello how are you 335