import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**This method checks if the operands are integers.
     *
     * @param s tag.
     * @return check tag.
     */
    public boolean isInteger(final String s)
    {
        final Matcher mat;

        boolean check = true;

        mat = INTEGER_PATTERN.matcher(s);

        if(!mat.matches())
        {
            check = false;
        }

        return check;

    }