function parse()
{
	if (text.indexOf('~~') === -1)
	{
		return;
	}

	var m, regexp = /~~[^\x17]+?~~(?!~)/g;
	while (m = regexp.exec(text))
	{
		var match    = m[0],
			matchPos = +m['index'],
			matchLen = match.length,
			endPos   = matchPos + matchLen - 2;

		addTagPair('DEL', matchPos, 2, endPos, 2);
		overwrite(matchPos, 2);
		overwrite(endPos, 2);
	}
}