import java.util.regex.*;
 
class Ideone
{
	public static void main (String[] args) {
		System.out.println(extractInt(""));
		System.out.println(extractInt("heyhow$98765$you"));
		System.out.println(extractInt("heyhow$$areyou"));
		System.out.println(extractInt("heyhow$xyz$areyou"));
		System.out.println(extractInt("heyhow$42x$areyou"));
	}
	private static int extractInt(String input) {
		Matcher m = Pattern.compile("\\$([0-9]+)\\$").matcher(input);
		if (! m.find())
			return 0;
		return Integer.parseInt(m.group(1));
	}
}

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