<?

// this file defines commonly used regular expressions for use with the ereg() function throughout
// the site.  Each of the regular expressions will be described below:

define("NUMBER", "^-?[0-9]+$");					// optional negative followed by one or more digits
define("FLOAT", "^-?[0-9]+(\.[0-9]+)?$");		// optional negative, one or mor digits, a point, one or more digits

// the date and time regular expressions take pains to be as exact as possible.  Many times, ranges of numbers 
// are specified (for example, months only go from 01 to 12 so we can specify a month as [0-1][0-9] rather than
// [0-9]{2} which would alow 45 as a month).  DATETIME is simply that -- is a YYYY-MM-DD HH:MM:SS field from
// the database

define("MM_DD_YYYY", "^([0-1]?[0-9])-([0-3]?[0-9])-([1-2][0-9]{3})$");
define("YYYY_MM_DD", "^([1-2][0-9]{3})-([0-1]?[0-9])-([0-3]?[0-9])$");
define("HH_MM", "^([1-2]?[0-9]):([0-5][0-9]) ?([apAP][mM])?$");				// 12 hour format with optional AM/PM
define("HH_MM_SS", "^([0-2][0-9]):([0-5][0-9]):([0-5][0-9])$");				// 24 hour format (usually for database)
define("HH_MM_AMPM", "^([0-1]?[0-9]):?([0-5][0-9])? ?([aApP][mM]?)$");		// 12 hour format with required AM/PM
define("DATETIME",   "^([1-2][0-9]{3})-([0-1][0-9])-([0-3][0-9]) ([0-2][0-9]):([0-5][0-9]):([0-5][0-9])$");

// to differentiate between SSNs and UINs in the database, SSNs include dashes and UINs do not.

define("SSN", "^[0-9]{3}-[0-9]{2}-[0-9]{4}$");
define("UIN", "^[0-9]{9}$");

// zip codes are allowed with and without the optional four-digit zip code extension

define("ZIP_CODE", "^[0-9]{5}(-[0-9]{4})?$");

// For phone numbers, we have two expressions, one specifically for US numbers and one for non-US numbers
// The US expression recognizes a required area code (3 digits), exchange (3 digits), and number (4 digits)
// each seperated by a dash and an optional extension which is preceeded by an x and has no more than 16
// digits.  The international expression just recognizes no more than 30 number, dash, space, or x
// characters.  Notice that a US number could be identified by the non-US expression.

define("US_PHONE", "^([0-9]{3})-([0-9]{3})-([0-9]{4})( x[0-9]{1,16})?$");
define("INT_PHONE", "^[- x0-9]{0,30}$");					// allowing a literal dash, so it must be first

// The email expression was taken from http://www.quanetic.com/regex.php and altered for the ereg() function
// rather than the preg() function.  It recognizes any number of characters before an @ sign and then
// a series of characters which are not (, ), ;, :, ",", <, and, > folloed by a 2 through 4 digit extension

define ("EMAIL", "^(.+)@([^\(\);:,<>]+)\.([a-zA-Z]{2,4})$");

// GPAs are a number from zero to four followed by a . and an upto 3 digit number:

define("GPA", "^([0-9])\.([0-9]{1,3})$");

// a file name without a path (like ereg_codes.php)

define("FILENAME", "^(.*)\.(.*)$");				// any number of characters followed by a dot followed by any number of characters

?>