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`import java.util.regex.*;

class RegexDemo{ public static void main (String[] args) throws java.lang.Exception{ //matches numbers only String regexStr = "^[0-9]*$"; System.out.println(Pattern.matches(regexStr,"97845613000")); System.out.println(Pattern.matches(regexStr,"19432")); System.out.println(Pattern.matches(regexStr,"519Ah"));

	//matches 10-digit numbers only
	regexStr = "^[0-9]{10}$";
	System.out.println(Pattern.matches(regexStr,"6576767"));
	System.out.println(Pattern.matches(regexStr,"9784561300"));
	System.out.println(Pattern.matches(regexStr,"F784561300"));
	
	//matches numbers and dashes, any order really.
	regexStr = "^[0-9\\-]*$";
	System.out.println(Pattern.matches(regexStr,"97-8456-13-0-0"));
	System.out.println(Pattern.matches(regexStr,"9-7-8-4-5-6-1-3-0-0"));
	
	//matches 9999999999, 1-999-999-9999 and 999-999-9999
	regexStr = "^(1\\-)?[0-9]{3}\\-?[0-9]{3}\\-?[0-9]{4}$"; 
	System.out.println(Pattern.matches(regexStr,"9784561300"));
	System.out.println(Pattern.matches(regexStr,"9-784561300"));
	System.out.println(Pattern.matches(regexStr,"978-456-1300"));
	System.out.println(Pattern.matches(regexStr,"97-8456-13-0-0"));
}

}`