<?php

/**
 * @author     Mike Cochrane <mikec@mikenz.geek.nz>
 * @author     Nick Pope <nick@nickpope.me.uk>
 * @copyright  Copyright © 2010, Mike Cochrane, Nick Pope
 * @license    http://www.apache.org/licenses/LICENSE-2.0  Apache License v2.0
 */

namespace App\Util\Lexer;

/**
 * Twitter Regex Abstract Class.
 *
 * Used by subclasses that need to parse tweets.
 *
 * Originally written by {@link http://github.com/mikenz Mike Cochrane}, this
 * is based on code by {@link http://github.com/mzsanford Matt Sanford} and
 * heavily modified by {@link http://github.com/ngnpope Nick Pope}.
 *
 * @author     Mike Cochrane <mikec@mikenz.geek.nz>
 * @author     Nick Pope <nick@nickpope.me.uk>
 * @copyright  Copyright © 2010, Mike Cochrane, Nick Pope
 * @license    http://www.apache.org/licenses/LICENSE-2.0  Apache License v2.0
 */
abstract class Regex
{
    /**
     * Contains all generated regular expressions.
     *
     * @var string The regex patterns.
     */
    protected static $patterns = [];

    /**
     * The tweet to be used in parsing.  This should be populated by the
     * constructor of all subclasses.
     *
     * @var string
     */
    protected $tweet = '';

    /**
     * This constructor is used to populate some variables.
     *
     * @param  string  $tweet  The tweet to parse.
     */
    protected function __construct($tweet = null)
    {
        $this->tweet = $tweet;
    }

    /**
     * Emulate a static initialiser while PHP doesn't have one.
     */
    public static function __static()
    {
        // Check whether we have initialized the regular expressions:
        static $initialized = false;
        if ($initialized) {
            return;
        }
        // Get a shorter reference to the regular expression array:
        $re = &self::$patterns;
        // Initialise local storage arrays:
        $tmp = [];

        // Expression to match whitespace characters.
        //
        //   0x0009-0x000D  Cc # <control-0009>..<control-000D>
        //   0x0020         Zs # SPACE
        //   0x0085         Cc # <control-0085>
        //   0x00A0         Zs # NO-BREAK SPACE
        //   0x1680         Zs # OGHAM SPACE MARK
        //   0x180E         Zs # MONGOLIAN VOWEL SEPARATOR
        //   0x2000-0x200A  Zs # EN QUAD..HAIR SPACE
        //   0x2028         Zl # LINE SEPARATOR
        //   0x2029         Zp # PARAGRAPH SEPARATOR
        //   0x202F         Zs # NARROW NO-BREAK SPACE
        //   0x205F         Zs # MEDIUM MATHEMATICAL SPACE
        //   0x3000         Zs # IDEOGRAPHIC SPACE
        $tmp['spaces'] = '\x{0009}-\x{000D}\x{0020}\x{0085}\x{00a0}\x{1680}\x{180E}\x{2000}-\x{200a}\x{2028}\x{2029}\x{202f}\x{205f}\x{3000}';

        // Invalid Characters:
        //   0xFFFE,0xFEFF # BOM
        //   0xFFFF        # Special
        //   0x202A-0x202E # Directional change
        $tmp['invalid_characters'] = '\x{202a}-\x{202e}\x{feff}\x{fffe}\x{ffff}';

        // Expression to match at and hash sign characters:
        $tmp['at_signs'] = '@＠';
        $tmp['hash_signs'] = '#＃';

        // Expression to match latin accented characters.
        //
        //   0x00C0-0x00D6
        //   0x00D8-0x00F6
        //   0x00F8-0x00FF
        //   0x0100-0x024f
        //   0x0253-0x0254
        //   0x0256-0x0257
        //   0x0259
        //   0x025b
        //   0x0263
        //   0x0268
        //   0x026f
        //   0x0272
        //   0x0289
        //   0x028b
        //   0x02bb
        //   0x0300-0x036f
        //   0x1e00-0x1eff
        //
        // Excludes 0x00D7 - multiplication sign (confusable with 'x').
        // Excludes 0x00F7 - division sign.
        $tmp['latin_accents'] = '\x{00c0}-\x{00d6}\x{00d8}-\x{00f6}\x{00f8}-\x{00ff}';
        $tmp['latin_accents'] .= '\x{0100}-\x{024f}\x{0253}-\x{0254}\x{0256}-\x{0257}';
        $tmp['latin_accents'] .= '\x{0259}\x{025b}\x{0263}\x{0268}\x{026f}\x{0272}\x{0289}\x{028b}\x{02bb}\x{0300}-\x{036f}\x{1e00}-\x{1eff}';

        // Expression to match RTL characters.
        //
        //   0x0600-0x06FF Arabic
        //   0x0750-0x077F Arabic Supplement
        //   0x08A0-0x08FF Arabic Extended-A
        //   0x0590-0x05FF Hebrew
        //   0xFB50-0xFDFF Arabic Presentation Forms-A
        //   0xFE70-0xFEFF Arabic Presentation Forms-B
        $tmp['rtl_chars'] = '\x{0600}-\x{06ff}\x{0750}-\x{077f}\x{08a0}-\x{08ff}\x{0590}-\x{05ff}\x{fb50}-\x{fdff}\x{fe70}-\x{feff}';

        $tmp['hashtag_letters'] = '\p{L}\p{M}';
        $tmp['hashtag_numerals'] = '\p{Nd}';
        // Hashtag special chars
        //
        //   _      underscore
        //   0x200c ZERO WIDTH NON-JOINER (ZWNJ)
        //   0x200d ZERO WIDTH JOINER (ZWJ)
        //   0xa67e CYRILLIC KAVYKA
        //   0x05be HEBREW PUNCTUATION MAQAF
        //   0x05f3 HEBREW PUNCTUATION GERESH
        //   0x05f4 HEBREW PUNCTUATION GERSHAYIM
        //   0xff5e FULLWIDTH TILDE
        //   0x301c WAVE DASH
        //   0x309b KATAKANA-HIRAGANA VOICED SOUND MARK
        //   0x309c KATAKANA-HIRAGANA SEMI-VOICED SOUND MARK
        //   0x30a0 KATAKANA-HIRAGANA DOUBLE HYPHEN
        //   0x30fb KATAKANA MIDDLE DOT
        //   0x3003 DITTO MARK
        //   0x0f0b TIBETAN MARK INTERSYLLABIC TSHEG
        //   0x0f0c TIBETAN MARK DELIMITER TSHEG BSTAR
        //   0x00b7 MIDDLE DOT
        $tmp['hashtag_special_chars'] = '_\x{200c}\x{200d}\x{a67e}\x{05be}\x{05f3}\x{05f4}\x{ff5e}\x{301c}\x{309b}\x{309c}\x{30a0}\x{30fb}\x{3003}\x{0f0b}\x{0f0c}\x{00b7}';
        $tmp['hashtag_letters_numerals_set'] = '['.$tmp['hashtag_letters'].$tmp['hashtag_numerals'].$tmp['hashtag_special_chars'].']';
        $tmp['hashtag_letters_set'] = '['.$tmp['hashtag_letters'].']';
        $tmp['hashtag_boundary'] = '(?:\A|\x{fe0e}|\x{fe0f}|[^&'.$tmp['hashtag_letters'].$tmp['hashtag_numerals'].$tmp['hashtag_special_chars'].'])';
        $tmp['hashtag'] = '('.$tmp['hashtag_boundary'].')(#|\x{ff03})(?!\x{fe0f}|\x{20e3})('.$tmp['hashtag_letters_numerals_set'].'*'.$tmp['hashtag_letters_set'].$tmp['hashtag_letters_numerals_set'].'*)';

        $re['valid_hashtag'] = '/'.$tmp['hashtag'].'(?=(.*|$))/iu';
        $re['end_hashtag_match'] = '/\A(?:['.$tmp['hash_signs'].']|:\/\/)/u';

        // XXX: PHP doesn't have Ruby's $' (dollar apostrophe) so we have to capture
        //      $after in the following regular expression.  Note that we only use a
        //      look-ahead capture here and don't append $after when we return.
        $tmp['valid_mention_preceding_chars'] = '([^a-zA-Z0-9_!#\$%&*@＠\/]|^|(?:^|[^a-z0-9_+~.-])RT:?)';

        $re['valid_mentions_or_lists'] = '/'.$tmp['valid_mention_preceding_chars'].'(['.$tmp['at_signs'].'])([\p{L}0-9_\-.]{1,20})((\/[a-z][a-z0-9_\-]{0,24})?(?=(.*|$))(?:@[a-z0-9\.\-]+[a-z0-9]+)?)/iu';

        $re['valid_reply'] = '/^(?:['.$tmp['spaces'].'])*['.$tmp['at_signs'].']([a-z0-9_\-.]{1,20})(?=(.*|$))/iu';
        $re['end_mention_match'] = '/\A(?:['.$tmp['at_signs'].']|['.$tmp['latin_accents'].']|:\/\/)/iu';

        // URL related hash regex collection

        $tmp['valid_url_preceding_chars'] = '(?:[^A-Z0-9_@＠\$#＃\.'.$tmp['invalid_characters'].']|^)';

        $tmp['domain_valid_chars'] = '0-9a-z'.$tmp['latin_accents'];
        $tmp['valid_subdomain'] = '(?>(?:['.$tmp['domain_valid_chars'].']['.$tmp['domain_valid_chars'].'\-_]*)?['.$tmp['domain_valid_chars'].']\.)';
        $tmp['valid_domain_name'] = '(?:(?:['.$tmp['domain_valid_chars'].']['.$tmp['domain_valid_chars'].'\-]*)?['.$tmp['domain_valid_chars'].']\.)';
        $tmp['domain_valid_unicode_chars'] = '[^\p{P}\p{Z}\p{C}'.$tmp['invalid_characters'].$tmp['spaces'].']';

        $gTLD = 'abb|abbott|abogado|academy|accenture|accountant|accountants|aco|active|actor|ads|adult|aeg|aero|afl|agency|aig|airforce|airtel|allfinanz|alsace|amsterdam|android|apartments|app|aquarelle|archi|army|arpa|asia|associates|attorney|auction|audio|auto|autos|axa|azure|band|bank|bar|barcelona|barclaycard|barclays|bargains|bauhaus|bayern|bbc|bbva|bcn|beer|bentley|berlin|best|bet|bharti|bible|bid|bike|bing|bingo|bio|biz|black|blackfriday|bloomberg|blue|bmw|bnl|bnpparibas|boats|bond|boo|boots|boutique|bradesco|bridgestone|broker|brother|brussels|budapest|build|builders|business|buzz|bzh|cab|cafe|cal|camera|camp|cancerresearch|canon|capetown|capital|caravan|cards|care|career|careers|cars|cartier|casa|cash|casino|cat|catering|cba|cbn|ceb|center|ceo|cern|cfa|cfd|chanel|channel|chat|cheap|chloe|christmas|chrome|church|cisco|citic|city|claims|cleaning|click|clinic|clothing|cloud|club|coach|codes|coffee|college|cologne|com|commbank|community|company|computer|condos|construction|consulting|contractors|cooking|cool|coop|corsica|country|coupons|courses|credit|creditcard|cricket|crown|crs|cruises|cuisinella|cymru|cyou|dabur|dad|dance|date|dating|datsun|day|dclk|deals|degree|delivery|delta|democrat|dental|dentist|desi|design|dev|diamonds|diet|digital|direct|directory|discount|dnp|docs|dog|doha|domains|doosan|download|drive|durban|dvag|earth|eat|edu|education|email|emerck|energy|engineer|engineering|enterprises|epson|equipment|erni|esq|estate|eurovision|eus|events|everbank|exchange|expert|exposed|express|fage|fail|faith|family|fan|fans|farm|fashion|feedback|film|finance|financial|firmdale|fish|fishing|fit|fitness|flights|florist|flowers|flsmidth|fly|foo|football|forex|forsale|forum|foundation|frl|frogans|fund|furniture|futbol|fyi|gal|gallery|game|garden|gbiz|gdn|gent|genting|ggee|gift|gifts|gives|giving|glass|gle|global|globo|gmail|gmo|gmx|gold|goldpoint|golf|goo|goog|google|gop|gov|graphics|gratis|green|gripe|group|guge|guide|guitars|guru|hamburg|hangout|haus|healthcare|help|here|hermes|hiphop|hitachi|hiv|hockey|holdings|holiday|homedepot|homes|honda|horse|host|hosting|hoteles|hotmail|house|how|hsbc|ibm|icbc|ice|icu|ifm|iinet|immo|immobilien|industries|infiniti|info|ing|ink|institute|insure|int|international|investments|ipiranga|irish|ist|istanbul|itau|iwc|java|jcb|jetzt|jewelry|jlc|jll|jobs|joburg|jprs|juegos|kaufen|kddi|kim|kitchen|kiwi|koeln|komatsu|krd|kred|kyoto|lacaixa|lancaster|land|lasalle|lat|latrobe|law|lawyer|lds|lease|leclerc|legal|lexus|lgbt|liaison|lidl|life|lighting|limited|limo|link|live|lixil|loan|loans|lol|london|lotte|lotto|love|ltda|lupin|luxe|luxury|madrid|maif|maison|man|management|mango|market|marketing|markets|marriott|mba|media|meet|melbourne|meme|memorial|men|menu|miami|microsoft|mil|mini|mma|mobi|moda|moe|mom|monash|money|montblanc|mormon|mortgage|moscow|motorcycles|mov|movie|movistar|mtn|mtpc|museum|nadex|nagoya|name|navy|nec|net|netbank|network|neustar|new|news|nexus|ngo|nhk|nico|ninja|nissan|nokia|nra|nrw|ntt|nyc|office|okinawa|omega|one|ong|onl|online|ooo|oracle|orange|org|organic|osaka|otsuka|ovh|page|panerai|paris|partners|parts|party|pet|pharmacy|philips|photo|photography|photos|physio|piaget|pics|pictet|pictures|pink|pizza|place|play|plumbing|plus|pohl|poker|porn|post|praxi|press|pro|prod|productions|prof|properties|property|pub|qpon|quebec|racing|realtor|realty|recipes|red|redstone|rehab|reise|reisen|reit|ren|rent|rentals|repair|report|republican|rest|restaurant|review|reviews|rich|ricoh|rio|rip|rocks|rodeo|rsvp|ruhr|run|ryukyu|saarland|sakura|sale|samsung|sandvik|sandvikcoromant|sanofi|sap|sarl|saxo|sca|scb|schmidt|scholarships|school|schule|schwarz|science|scor|scot|seat|seek|sener|services|sew|sex|sexy|shiksha|shoes|show|shriram|singles|site|ski|sky|skype|sncf|soccer|social|software|sohu|solar|solutions|sony|soy|space|spiegel|spreadbetting|srl|starhub|statoil|studio|study|style|sucks|supplies|supply|support|surf|surgery|suzuki|swatch|swiss|sydney|systems|taipei|tatamotors|tatar|tattoo|tax|taxi|team|tech|technology|tel|telefonica|temasek|tennis|thd|theater|tickets|tienda|tips|tires|tirol|today|tokyo|tools|top|toray|toshiba|tours|town|toyota|toys|trade|trading|training|travel|trust|tui|ubs|university|uno|uol|vacations|vegas|ventures|vermögensberater|vermögensberatung|versicherung|vet|viajes|video|villas|vin|vision|vista|vistaprint|vlaanderen|vodka|vote|voting|voto|voyage|wales|walter|wang|watch|webcam|website|wed|wedding|weir|whoswho|wien|wiki|williamhill|win|windows|wine|wme|work|works|world|wtc|wtf|xbox|xerox|xin|xperia|xxx|xyz|yachts|yandex|yodobashi|yoga|yokohama|youtube|zip|zone|zuerich|дети|ком|москва|онлайн|орг|рус|сайт|קום|بازار|شبكة|كوم|موقع|कॉम|नेट|संगठन|คอม|みんな|グーグル|コム|世界|中信|中文网|企业|佛山|信息|健康|八卦|公司|公益|商城|商店|商标|在线|大拿|娱乐|工行|广东|慈善|我爱你|手机|政务|政府|新闻|时尚|机构|淡马锡|游戏|点看|移动|组织机构|网址|网店|网络|谷歌|集团|飞利浦|餐厅|닷넷|닷컴|삼성|onion';
        $ccTLD = '한국|香港|澳門|新加坡|台灣|台湾|中國|中国|გე|ไทย|ලංකා|ഭാരതം|ಭಾರತ|భారత్|சிங்கப்பூர்|இலங்கை|இந்தியா|ଭାରତ|ભારત|ਭਾਰਤ|ভাৰত|ভারত|বাংলা|भारोत|भारतम्|भारत|ڀارت|پاکستان|مليسيا|مصر|قطر|فلسطين|عمان|عراق|سورية|سودان|تونس|بھارت|بارت|ایران|امارات|المغرب|السعودية|الجزائر|الاردن|հայ|қаз|укр|срб|рф|мон|мкд|ею|бел|бг|ελ|zw|zm|za|yt|ye|ws|wf|vu|vn|vi|vg|ve|vc|va|uz|uy|us|um|uk|ug|ua|tz|tw|tv|tt|tr|tp|to|tn|tm|tl|tk|tj|th|tg|tf|td|tc|sz|sy|sx|sv|su|st|ss|sr|so|sn|sm|sl|sk|sj|si|sh|sg|se|sd|sc|sb|sa|rw|ru|rs|ro|re|qa|py|pw|pt|ps|pr|pn|pm|pl|pk|ph|pg|pf|pe|pa|om|nz|nu|nr|np|no|nl|ni|ng|nf|ne|nc|na|mz|my|mx|mw|mv|mu|mt|ms|mr|mq|mp|mo|mn|mm|ml|mk|mh|mg|mf|me|md|mc|ma|ly|lv|lu|lt|ls|lr|lk|li|lc|lb|la|kz|ky|kw|kr|kp|kn|km|ki|kh|kg|ke|jp|jo|jm|je|it|is|ir|iq|io|in|im|il|ie|id|hu|ht|hr|hn|hm|hk|gy|gw|gu|gt|gs|gr|gq|gp|gn|gm|gl|gi|gh|gg|gf|ge|gd|gb|ga|fr|fo|fm|fk|fj|fi|eu|et|es|er|eh|eg|ee|ec|dz|do|dm|dk|dj|de|cz|cy|cx|cw|cv|cu|cr|co|cn|cm|cl|ck|ci|ch|cg|cf|cd|cc|ca|bz|by|bw|bv|bt|bs|br|bq|bo|bn|bm|bl|bj|bi|bh|bg|bf|be|bd|bb|ba|az|ax|aw|au|at|as|ar|aq|ao|an|am|al|ai|ag|af|ae|ad|ac';

        $tmp['valid_gTLD'] = '(?:(?:'.$gTLD.')(?=[^0-9a-z@]|$))';
        $tmp['valid_ccTLD'] = '(?:(?:'.$ccTLD.')(?=[^0-9a-z@]|$))';
        $tmp['valid_special_ccTLD'] = '(?:(?:'.'co|tv'.')(?=[^0-9a-z@]|$))';
        $tmp['valid_punycode'] = '(?:xn--[0-9a-z]+)';

        $tmp['valid_domain'] = '(?:'                                            // subdomains + domain + TLD
            .$tmp['valid_subdomain'].'+'.$tmp['valid_domain_name']         // e.g. www.twitter.com, foo.co.jp, bar.co.uk
            .'(?:'.$tmp['valid_gTLD'].'|'.$tmp['valid_ccTLD'].'|'.$tmp['valid_punycode'].'))'
            .'|(?:'                                                                // domain + gTLD | some ccTLD
            .$tmp['valid_domain_name']                                         // e.g. twitter.com
            .'(?:'.$tmp['valid_gTLD'].'|'.$tmp['valid_punycode'].'|'.$tmp['valid_special_ccTLD'].')'
            .')'
            .'|(?:(?:(?<=http:\/\/)|(?<=https:\/\/))'
            .'(?:'
            .'(?:'.$tmp['valid_domain_name'].$tmp['valid_ccTLD'].')' // protocol + domain + ccTLD
            .'|(?:'                                                                // protocol + unicode domain + TLD
            .$tmp['domain_valid_unicode_chars'].'+\.'
            .'(?:'.$tmp['valid_gTLD'].'|'.$tmp['valid_ccTLD'].')'
            .')'
            .')'
            .')'
            .'|(?:'                                                                // domain + ccTLD + '/'
            .$tmp['valid_domain_name'].$tmp['valid_ccTLD'].'(?=\/)'            // e.g. t.co/
            .')';
        // Used by the extractor:
        $re['valid_ascii_domain'] = '/'.$tmp['valid_subdomain'].'*'.$tmp['valid_domain_name'].'(?:'.$tmp['valid_gTLD'].'|'.$tmp['valid_ccTLD'].'|'.$tmp['valid_punycode'].')/iu';

        // Used by the extractor for stricter t.co URL extraction:
        $re['valid_tco_url'] = '/^https?:\/\/t\.co\/[a-z0-9]+/iu';

        // Used by the extractor to filter out unwanted URLs:
        $re['invalid_short_domain'] = '/\A'.$tmp['valid_domain_name'].$tmp['valid_ccTLD'].'\Z/iu';
        $re['valid_special_short_domain'] = '/\A'.$tmp['valid_domain_name'].$tmp['valid_special_ccTLD'].'\Z/iu';
        $re['invalid_url_without_protocol_preceding_chars'] = '/[\-_.\/]\z/iu';

        $tmp['valid_port_number'] = '[0-9]+';

        $tmp['valid_general_url_path_chars'] = '[a-z\p{Cyrillic}0-9!\*;:=\+\,\.\$\/%#\[\]\-_~&|@'.$tmp['latin_accents'].']';
        // Allow URL paths to contain up to two nested levels of balanced parentheses:
        // 1. Used in Wikipedia URLs, e.g. /Primer_(film)
        // 2. Used in IIS sessions, e.g. /S(dfd346)/
        // 3. Used in Rdio URLs like /track/We_Up_(Album_Version_(Edited))/
        $tmp['valid_url_balanced_parens'] = '(?:\('
            .'(?:'.$tmp['valid_general_url_path_chars'].'+'
            .'|'
            // allow one nested level of balanced parentheses
            .'(?:'
            .$tmp['valid_general_url_path_chars'].'*'
            .'\('.$tmp['valid_general_url_path_chars'].'+'.'\)'
            .$tmp['valid_general_url_path_chars'].'*'
            .')'
            .')'
            .'\))';
        // Valid end-of-path characters (so /foo. does not gobble the period).
        // 1. Allow =&# for empty URL parameters and other URL-join artifacts.
        $tmp['valid_url_path_ending_chars'] = '[a-z\p{Cyrillic}0-9=_#\/\+\-'.$tmp['latin_accents'].']|(?:'.$tmp['valid_url_balanced_parens'].')';
        $tmp['valid_url_path'] = '(?:(?:'
            .$tmp['valid_general_url_path_chars'].'*(?:'
            .$tmp['valid_url_balanced_parens'].' '
            .$tmp['valid_general_url_path_chars'].'*)*'
            .$tmp['valid_url_path_ending_chars'].')|(?:@'
            .$tmp['valid_general_url_path_chars'].'+\/))';

        $tmp['valid_url_query_chars'] = '[a-z0-9!?\*\'\(\);:&=\+\$\/%#\[\]\-_\.,~|@]';
        $tmp['valid_url_query_ending_chars'] = '[a-z0-9_&=#\/\-]';

        $re['valid_url'] = '/(?:'                           // $1 Complete match (preg_match() already matches everything.)
            .'('.$tmp['valid_url_preceding_chars'].')' // $2 Preceding characters
            .'('                                           // $3 Complete URL
            .'(https?:\/\/)?'                              // $4 Protocol (optional)
            .'('.$tmp['valid_domain'].')'              // $5 Domain(s)
            .'(?::('.$tmp['valid_port_number'].'))?'   // $6 Port number (optional)
            .'(\/'.$tmp['valid_url_path'].'*)?'        // $7 URL Path
            .'(\?'.$tmp['valid_url_query_chars'].'*'.$tmp['valid_url_query_ending_chars'].')?' // $8 Query String
            .')'
            .')/iux';

        $tmp['cash_signs'] = '\$';
        $tmp['cashtag'] = '[a-z]{1,6}(?:[._][a-z]{1,2})?';
        $re['valid_cashtag'] = '/(^|['.$tmp['spaces'].'])(['.$tmp['cash_signs'].'])('.$tmp['cashtag'].')(?=($|\s|[[:punct:]]))/iu';
        $re['end_cashtag_match'] = '/\A(?:['.$tmp['cash_signs'].']|:\/\/)/u';

        // These URL validation pattern strings are based on the ABNF from RFC 3986
        $tmp['validate_url_unreserved'] = '[a-z\p{Cyrillic}0-9\-._~]';
        $tmp['validate_url_pct_encoded'] = '(?:%[0-9a-f]{2})';
        $tmp['validate_url_sub_delims'] = '[!$&\'()*+,;=]';
        $tmp['validate_url_pchar'] = '(?:'.$tmp['validate_url_unreserved'].'|'.$tmp['validate_url_pct_encoded'].'|'.$tmp['validate_url_sub_delims'].'|[:\|@])'; // /iox

        $tmp['validate_url_userinfo'] = '(?:'.$tmp['validate_url_unreserved'].'|'.$tmp['validate_url_pct_encoded'].'|'.$tmp['validate_url_sub_delims'].'|:)*'; // /iox

        $tmp['validate_url_dec_octet'] = '(?:[0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])'; // /i
        $tmp['validate_url_ipv4'] = '(?:'.$tmp['validate_url_dec_octet'].'(?:\.'.$tmp['validate_url_dec_octet'].'){3})'; // /iox
        // Punting on real IPv6 validation for now
        $tmp['validate_url_ipv6'] = '(?:\[[a-f0-9:\.]+\])'; // /i
        // Also punting on IPvFuture for now
        $tmp['validate_url_ip'] = '(?:'.$tmp['validate_url_ipv4'].'|'.$tmp['validate_url_ipv6'].')'; // /iox
        // This is more strict than the rfc specifies
        $tmp['validate_url_subdomain_segment'] = '(?:[a-z0-9](?:[a-z0-9_\-]*[a-z0-9])?)'; // /i
        $tmp['validate_url_domain_segment'] = '(?:[a-z0-9](?:[a-z0-9\-]*[a-z0-9])?)'; // /i
        $tmp['validate_url_domain_tld'] = '(?:[a-z](?:[a-z0-9\-]*[a-z0-9])?)'; // /i
        $tmp['validate_url_domain'] = '(?:(?:'.$tmp['validate_url_subdomain_segment'].'\.)*(?:'.$tmp['validate_url_domain_segment'].'\.)'.$tmp['validate_url_domain_tld'].')'; // /iox

        $tmp['validate_url_host'] = '(?:'.$tmp['validate_url_ip'].'|'.$tmp['validate_url_domain'].')'; // /iox
        // Unencoded internationalized domains - this doesn't check for invalid UTF-8 sequences
        $tmp['validate_url_unicode_subdomain_segment'] = '(?:(?:[a-z0-9]|[^\x00-\x7f])(?:(?:[a-z0-9_\-]|[^\x00-\x7f])*(?:[a-z0-9]|[^\x00-\x7f]))?)'; // /ix
        $tmp['validate_url_unicode_domain_segment'] = '(?:(?:[a-z0-9]|[^\x00-\x7f])(?:(?:[a-z0-9\-]|[^\x00-\x7f])*(?:[a-z0-9]|[^\x00-\x7f]))?)'; // /ix
        $tmp['validate_url_unicode_domain_tld'] = '(?:(?:[a-z]|[^\x00-\x7f])(?:(?:[a-z0-9\-]|[^\x00-\x7f])*(?:[a-z0-9]|[^\x00-\x7f]))?)'; // /ix
        $tmp['validate_url_unicode_domain'] = '(?:(?:'.$tmp['validate_url_unicode_subdomain_segment'].'\.)*(?:'.$tmp['validate_url_unicode_domain_segment'].'\.)'.$tmp['validate_url_unicode_domain_tld'].')'; // /iox

        $tmp['validate_url_unicode_host'] = '(?:'.$tmp['validate_url_ip'].'|'.$tmp['validate_url_unicode_domain'].')'; // /iox

        $tmp['validate_url_port'] = '[0-9]{1,5}';

        $re['validate_url_unicode_authority'] = '/'
            .'(?:('.$tmp['validate_url_userinfo'].')@)?' //  $1 userinfo
            .'('.$tmp['validate_url_unicode_host'].')'   //  $2 host
            .'(?::('.$tmp['validate_url_port'].'))?'     //  $3 port
            .'/iux';

        $re['validate_url_authority'] = '/'
            .'(?:('.$tmp['validate_url_userinfo'].')@)?' //  $1 userinfo
            .'('.$tmp['validate_url_host'].')'           //  $2 host
            .'(?::('.$tmp['validate_url_port'].'))?'     //  $3 port
            .'/ix';

        $re['validate_url_scheme'] = '/(?:[a-z][a-z0-9+\-.]*)/i';
        $re['validate_url_path'] = '/(\/'.$tmp['validate_url_pchar'].'*)*/iu';
        $re['validate_url_query'] = '/('.$tmp['validate_url_pchar'].'|\/|\?)*/iu';
        $re['validate_url_fragment'] = '/('.$tmp['validate_url_pchar'].'|\/|\?)*/iu';

        // Modified version of RFC 3986 Appendix B
        $re['validate_url_unencoded'] = '/^' //  Full URL
            .'(?:'
            .'([^:\/?#]+):\/\/' //  $1 Scheme
            .')?'
            .'([^\/?#]*)'       //  $2 Authority
            .'([^?#]*)'         //  $3 Path
            .'(?:'
            .'\?([^#]*)'        //  $4 Query
            .')?'
            .'(?:'
            .'\#(.*)'           //  $5 Fragment
            .')?$/iux';

        $re['invalid_characters'] = '/['.$tmp['invalid_characters'].']/u';

        $re['rtl_chars'] = '/['.$tmp['rtl_chars'].']/iu';

        // Flag that initialization is complete:
        $initialized = true;
    }
}

// Cause regular expressions to be initialized as soon as this file is loaded:
Regex::__static();
