import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
class Test {
    public static void main (String[] args) throws java.lang.Exception
    {
        String line = "wall street 4 06:28 07:29 07:59 08:29 08:59 30 19:59 20:29 21:04 22:04 23:04 00:04 00:30";
        System.out.println( "Input:  " + line );
        Pattern pattern = Pattern.compile("(?<=\\d\\s)\\d{2}(?=\\s\\d)");
    	Matcher m = pattern.matcher(line);
    	while (m.find()) {
            int value = Integer.parseInt(m.group().trim());
            line = m.replaceFirst("");
            System.out.println( "Output: " + line );
    	}    
    }
}

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