public function linkUrlsAndEscapeHtml($text)
	{
		// We can abort if there is no . in $text
		if ( strpos($text, '.') === false )
		{
			return $this->escapeHtml($text);
		}

		$html = '';

		$position = 0;

		$match = array();

		while (preg_match($this->buildRegex(), $text, $match, PREG_OFFSET_CAPTURE, $position))
		{
			list($url, $urlPosition) = $match[0];

			// Add the text leading up to the URL.
			$html .= $this->escapeHtml(substr($text, $position, $urlPosition - $position));

			$scheme      = $match[1][0];
			$username    = $match[2][0];
			$password    = $match[3][0];
			$domain      = $match[4][0];
			$afterDomain = $match[5][0]; // everything following the domain
			$port        = $match[6][0];
			$path        = $match[7][0];

			// Check that the TLD is valid or that $domain is an IP address.
			$tld = strtolower(strrchr($domain, '.'));

			$validTlds = $this->validTlds;

			if (preg_match('{^\.[0-9]{1,3}$}', $tld) || isset($validTlds[$tld]))
			{
				// Do not permit implicit scheme if a password is specified, as
				// this causes too many errors (e.g. "my email:foo@example.org").
				if ( ! $scheme && $password )
				{
					$html .= $this->escapeHtml($username);

					// Continue text parsing at the ':' following the "username".
					$position = $urlPosition + strlen($username);

					continue;
				}

				if ( ! $scheme && $username && ! $password && ! $afterDomain )
				{
					// Looks like an email address.
					$emailLinkCreator = $this->emailLinkCreator;

					// Add the hyperlink.
					$html .= $emailLinkCreator($url, $url);
				}
				else
				{
					// Prepend http:// if no scheme is specified
					$completeUrl = $scheme ? $url : "http://$url";
					$linkText = "$domain$port$path";

					$htmlLinkCreator = $this->htmlLinkCreator;

					// Add the hyperlink.
					$html .= $htmlLinkCreator($completeUrl, $linkText);
				}
			}
			else
			{
				// Not a valid URL.
				$html .= $this->escapeHtml($url);
			}

			// Continue text parsing from after the URL.
			$position = $urlPosition + strlen($url);
		}

		// Add the remainder of the text.
		$html .= $this->escapeHtml(substr($text, $position));

		return $html;
	}