Rename 'kohana' to 'system' to conform to the Kohana filesystem layout. I'm comfortable with us not clearly drawing the distinction about the fact that it's Kohana.

system/helpers/format.php

@@ -0,0 +1,66 @@
+<?php defined('SYSPATH') OR die('No direct access allowed.');
+/**
+ * Format helper class.
+ *
+ * $Id: format.php 4070 2009-03-11 20:37:38Z Geert $
+ *
+ * @package    Core
+ * @author     Kohana Team
+ * @copyright  (c) 2007-2008 Kohana Team
+ * @license    http://kohanaphp.com/license.html
+ */
+class format_Core {
+
+	/**
+	 * Formats a phone number according to the specified format.
+	 *
+	 * @param   string  phone number
+	 * @param   string  format string
+	 * @return  string
+	 */
+	public static function phone($number, $format = '3-3-4')
+	{
+		// Get rid of all non-digit characters in number string
+		$number_clean = preg_replace('/\D+/', '', (string) $number);
+
+		// Array of digits we need for a valid format
+		$format_parts = preg_split('/[^1-9][^0-9]*/', $format, -1, PREG_SPLIT_NO_EMPTY);
+
+		// Number must match digit count of a valid format
+		if (strlen($number_clean) !== array_sum($format_parts))
+			return $number;
+
+		// Build regex
+		$regex = '(\d{'.implode('})(\d{', $format_parts).'})';
+
+		// Build replace string
+		for ($i = 1, $c = count($format_parts); $i <= $c; $i++)
+		{
+			$format = preg_replace('/(?<!\$)[1-9][0-9]*/', '\$'.$i, $format, 1);
+		}
+
+		// Hocus pocus!
+		return preg_replace('/^'.$regex.'$/', $format, $number_clean);
+	}
+
+	/**
+	 * Formats a URL to contain a protocol at the beginning.
+	 *
+	 * @param   string  possibly incomplete URL
+	 * @return  string
+	 */
+	public static function url($str = '')
+	{
+		// Clear protocol-only strings like "http://"
+		if ($str === '' OR substr($str, -3) === '://')
+			return '';
+
+		// If no protocol given, prepend "http://" by default
+		if (strpos($str, '://') === FALSE)
+			return 'http://'.$str;
+
+		// Return the original URL
+		return $str;
+	}
+
+} // End format