source: trunk/www.guidonia.net/wp/wp-admin/js/word-count.dev.js@ 44

// Word count
(function($) {
        wpWordCount = {

                init : function() {
                        var t = this, last = 0, co = $('#content');

                        $('#wp-word-count').html( wordCountL10n.count.replace( /%d/, '<span id="word-count">0</span>' ) );
                        t.block = 0;
                        t.wc(co.val());
                        co.keyup( function(e) {
                                if ( e.keyCode == last ) return true;
                                if ( 13 == e.keyCode || 8 == last || 46 == last ) t.wc(co.val());
                                last = e.keyCode;
                                return true;
                        });
                },

                wc : function(tx) {
                        var t = this, w = $('#word-count'), tc = 0;

                        if ( t.block ) return;
                        t.block = 1;

                        setTimeout( function() {
                                if ( tx ) {
                                        tx = tx.replace( /<.[^<>]*?>/g, ' ' ).replace( /&nbsp;|&#160;/gi, ' ' );
                                        tx = tx.replace( /[0-9.(),;:!?%#$¿'"_+=\\/-]*/g, '' );
                                        tx.replace( /\S\s+/g, function(){tc++;} );
                                }
                                w.html(tc.toString());

                                setTimeout( function() { t.block = 0; }, 2000 );
                        }, 1 );
                }
        }

        $(document).ready( function(){ wpWordCount.init(); } );
}(jQuery));