--- /dev/null
+<?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
+ * @package Twitter
+ */
+
+/**
+ * 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
+ * @package Twitter
+ */
+abstract class Twitter_Regex {
+
+ /**
+ * Expression to at sign characters
+ *
+ * @var string
+ */
+ const REGEX_AT_SIGNS = '[@＠]';
+
+ /**
+ * Expression to match characters that may come before a URL.
+ *
+ * @var string
+ */
+ const REGEX_URL_CHARS_BEFORE = '(?:[^-\\/"\':!=a-z0-9_@＠]|^|\\:)';
+
+ /**
+ * Expression to match the domain portion of a URL.
+ *
+ * @var string
+ */
+ const REGEX_URL_DOMAIN = '(?:[^\\p{P}\\p{Lo}\\s][\\.-](?=[^\\p{P}\\p{Lo}\\s])|[^\\p{P}\\p{Lo}\\s])+\\.[a-z]{2,}(?::[0-9]+)?';
+
+ /**
+ * Expression to match handful of probable TLDs for protocol-less URLS.
+ *
+ * @var string
+ */
+ const REGEX_PROBABLE_TLD = '/\\.(?:com|net|org|gov|edu)$/iu';
+
+ /**
+ * Expression to match characters that may come in the URL path.
+ *
+ * @var string
+ */
+ const REGEX_URL_CHARS_PATH = '(?:(?:\\([a-z0-9!\\*\';:=\\+\\$\\/%#\\[\\]\\-_,~]+\\))|@[a-z0-9!\\*\';:=\\+\\$\\/%#\\[\\]\\-_,~]+\\/|[\\.\\,]?(?:[a-z0-9!\\*\';:=\\+\\$\\/%#\\[\\]\\-_~]|,(?!\s)))';
+
+ /**
+ * Expression to match characters that may come at the end of the URL path.
+ *
+ * @var string
+ */
+ const REGEX_URL_CHARS_PATH_END = '[a-z0-9=#\\/]';
+
+ /**
+ * Expression to match characters that may come in the URL query string.
+ *
+ * @var string
+ */
+ const REGEX_URL_CHARS_QUERY = '[a-z0-9!\\*\'\\(\\);:&=\\+\\$\\/%#\\[\\]\\-_\\.,~]';
+
+ /**
+ * Expression to match characters that may come at the end of the URL query
+ * string.
+ *
+ * @var string
+ */
+ const REGEX_URL_CHARS_QUERY_END = '[a-z0-9_&=#\\/]';
+
+ /**
+ * Expression to match a username followed by a list.
+ *
+ * @var string
+ */
+ const REGEX_USERNAME_LIST = '/([^a-z0-9_\/]|^|RT:?)([@＠]+)([a-z0-9_]{1,20})(\/[a-z][-_a-z0-9\x80-\xFF]{0,24})?([@＠\xC0-\xD6\xD8-\xF6\xF8-\xFF]?)/iu';
+
+ /**
+ * Expression to match a username mentioned anywhere in a tweet.
+ *
+ * @var string
+ */
+ const REGEX_USERNAME_MENTION = '/(^|[^a-z0-9_])[@＠]([a-z0-9_]{1,20})([@＠\xC0-\xD6\xD8-\xF6\xF8-\xFF]?)/iu';
+
+ /**
+ * Expression to match a hashtag.
+ *
+ * @var string
+ */
+ const REGEX_HASHTAG = '/(^|[^0-9A-Z&\/\?]+)([#＃]+)([0-9A-Z_]*[A-Z_]+[a-z0-9_üÀ-ÖØ-öø-ÿ]*)/iu';
+
+ /**
+ * Expression to match whitespace.
+ *
+ * Single byte whitespace characters
+ * 0x0009-0x000D White_Space # Cc # <control-0009>..<control-000D>
+ * 0x0020 White_Space # Zs # SPACE
+ * 0x0085 White_Space # Cc # <control-0085>
+ * 0x00A0 White_Space # Zs # NO-BREAK SPACE
+ * Multi byte whitespace characters
+ * 0x1680 White_Space # Zs # OGHAM SPACE MARK
+ * 0x180E White_Space # Zs # MONGOLIAN VOWEL SEPARATOR
+ * 0x2000-0x200A White_Space # Zs # EN QUAD..HAIR SPACE
+ * 0x2028 White_Space # Zl # LINE SEPARATOR
+ * 0x2029 White_Space # Zp # PARAGRAPH SEPARATOR
+ * 0x202F White_Space # Zs # NARROW NO-BREAK SPACE
+ * 0x205F White_Space # Zs # MEDIUM MATHEMATICAL SPACE
+ * 0x3000 White_Space # Zs # IDEOGRAPHIC SPACE
+ *
+ * @var string
+ */
+ const REGEX_WHITESPACE = '[\x09-\x0D\x20\x85\xA0]|\xe1\x9a\x80|\xe1\xa0\x8e|\xe2\x80[\x80-\x8a,\xa8,\xa9,\xaf\xdf]|\xe3\x80\x80';
+
+ /**
+ * Contains the complete valid URL pattern string.
+ *
+ * This should be generated the first time the constructor is called.
+ *
+ * @var string The regex pattern for a valid URL.
+ */
+ protected static $REGEX_VALID_URL = null;
+
+ /**
+ * Contains the reply username pattern string.
+ *
+ * This should be generated the first time the constructor is called.
+ *
+ * @var string The regex pattern for a reply username.
+ */
+ protected static $REGEX_REPLY_USERNAME = null;
+
+ /**
+ * 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) {
+ if (is_null(self::$REGEX_VALID_URL)) {
+ self::$REGEX_VALID_URL = '/(?:' # $1 Complete match (preg_match already matches everything.)
+ . '('.self::REGEX_URL_CHARS_BEFORE.')' # $2 Preceding character
+ . '(' # $3 Complete URL
+ . '((?:https?:\\/\\/|www\\.)?)' # $4 Protocol (or www)
+ . '('.self::REGEX_URL_DOMAIN.')' # $5 Domain(s) (and port)
+ . '(\\/'.self::REGEX_URL_CHARS_PATH.'*' # $6 URL Path
+ . self::REGEX_URL_CHARS_PATH_END.'?)?'
+ . '(\\?'.self::REGEX_URL_CHARS_QUERY.'*' # $7 Query String
+ . self::REGEX_URL_CHARS_QUERY_END.')?'
+ . ')'
+ . ')/iux';
+ }
+ if (is_null(self::$REGEX_REPLY_USERNAME)) {
+ self::$REGEX_REPLY_USERNAME = '/^('.self::REGEX_WHITESPACE.')*[@＠]([a-zA-Z0-9_]{1,20})/';
+ }
+ $this->tweet = $tweet;
+ }
+
+}
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