Find the attribute value for a specific attribute.

        :param attr: string of attribute name
        :returns: string of attribute value

def _get_template_attr(self, attr):
        '''Find the attribute value for a specific attribute.

        :param attr: string of attribute name
        :returns: string of attribute value
        '''

        attr_re = r'{0}\s+.*'.format(attr)

        attr_found = re.search(attr_re, self.template_str)
        if attr_found:
            attr_value = attr_found.group(0).replace(attr, '', 1)
            return attr_value.strip()