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Regular Expression re+ Metacharacter in Java
The subexpression/metacharacter “re+” matches one or more occurrences of the preceding expression.
Example 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); } }
Output
Number of matches: 4
Example 2
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Test { public static void main( String args[] ) { String regex = "[0-9]+"; Scanner sc = new Scanner(System.in); System.out.println("Enter an input string: "); String input = sc.nextLine(); //Creating a Pattern object Pattern p = Pattern.compile(regex); //Creating a Matcher object Matcher m = p.matcher(input); if(m.find()) { System.out.println("Given input contains digits"); } else { System.out.println("Given input doesn't contain digits"); } } }
Output 1
Enter an input string: sample text Given input doesn't contain digits
Output 2
Enter an input string: sample data 464 Given input contains digits
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