<?
/**
 * @package GilliGan
 */
/**
 *
 * Thanks to Jeffrey E. F. Friedl for his great work:
 * "Mastering Regular Expressions"
 */


/**
 * Identify topleveldomains with a regular expression
 */
define(
         "TOPLEVELDOMAIN", "(?i:(?i)"
                              ."com"
                             ."|edu"
                             ."|biz"
                             ."|in(?:t|fo)"
                             ."|mil"
                             ."|net"
                             ."|org"
                             ."|[a-z][a-z]"
                          .")"
      );

/**
 * Identify integer.
 */
define( "INTEGER", "(?:-?[1-9]\d*|0)" );

/**
 * Identify strings that are in single quotation in a text.
 */
define( "SINGLE_QUOTATION_STRING", "(?:'.*?[^\\\\](?:\\\\\\\\)*')" );

/**
 * Identify strings that are in double quotation in a text.
 */
define( "DOUBLE_QUOTATION_STRING", "(?:\".*?[^\\\\](?:\\\\\\\\)*\")" );

/**
 * Identify positive integer.
 */
define( "UNSIGNEDINTEGER", "(?:[1-9]\d*|0)" );

/**
 * Identify files of webgraphics.
 */
define( "WEBGRAPHICS", "[^/ &?=]+\.(?:(?i)gif|png|jpg|jpeg)" );

/**
 * Identify hexadecimal colors.
 */
define( "HEXCOLOR", "#[0-9a-fA-F]{6,6}" );

/**
 * Identify a time in ISO-format
 */
define( "ISOTIME", "([01]\d|2[0-3])(?::([0-5]\d)){1,2}" );

/**
 * Identify
 */
define(
        "EMAIL", "[-a-zA-Z0-9_.]+@"
                ."(([-a-zA-Z0-9]+\\.)++"  // domain
                .TOPLEVELDOMAIN
                ."|\[?([0-9]{1,3}\.){3,3}" // ip
                ."[0-9]{1,3}\]?)"
      );

/**
 * Identify websafe colors.
 */
define(
        "WEBSAFECOLOR", "#("
                         ."[0369cCfF]{3,3}"
                        ."|("
                          ."00"
                         ."|33"
                         ."|66"
                         ."|99"
                         ."|[cC][cC]"
                         ."|[fF][fF]"
                         ."){3,3}"
                        .")"
      );

/**
 * Identify webcolor names
 */
define(
        "WEBCOLORNAMES", "(?:(?i)"
                         ."Black"
                        ."|SlateGray"
                        ."|DarkGray"
                        ."|DimGray"
                        ."|Silver"
                        ."|Beige"
                        ."|WhiteSmoke"
                        ."|GhostWhite"
                        ."|SeaShell"
                        ."|Snow"
                        ."|Ivory"
                        ."|White"
                        ."|SandyBrown"
                        ."|BurlyWood"
                        ."|Peru"
                        ."|Sienna"
                        ."|SaddleBrown"
                        ."|Brown"
                        ."|Maroon"
                        ."|DarkRed"
                        ."|Red"
                        ."|FireBrick"
                        ."|Tomato"
                        ."|Coral"
                        ."|OrangeRed"
                        ."|Darkorange"
                        ."|Orange"
                        ."|Yellow"
                        ."|SpringGreen"
                        ."|MediumSpringGreen"
                        ."|YellowGreen"
                        ."|LawnGreen"
                        ."|Lime"
                        ."|LimeGreen"
                        ."|Green"
                        ."|ForestGreen"
                        ."|MediumSeaGreen"
                        ."|SeaGreen"
                        ."|OliveDrab"
                        ."|Olive"
                        ."|Navy"
                        ."|DarkCyan"
                        ."|Blue"
                        ."|MediumBlue"
                        ."|BlueViolet"
                        ."|DarkViolet"
                        ."|DarkOrchid"
                        ."|Indigo"
                        ."|DarkMagenta"
                        ."|Purple"
                        ."|VioletRed"
                        ."|PaleVioletRed"
                        ."|Plum"
                        ."|Violet"
                        .")"
      );
?>The value "0" is not valid value for a height.<br>The value has to be a number!