gistfile1.txt

 /**
 * User: kobkrit
 * Date: 5/18/12
 * Time: 2:44 PM
 */
var data = "";
process.stdin.resume();
process.stdin.setEncoding('utf8');

process.stdin.on('data', function (chunk) {
    data += chunk;
});

process.stdin.on('end', function () {
    //Delete attribute and value
    data = data.replace(/\\(cite|label|begin|end|ref|footnote|keywords)\{[^\}]+\}/g, "");
    //Delete attribute
    data = data.replace(/\\(item)/g, "");

    //Delete attribute but not value
    //External_Bucket \textbf{aaaa} => aaaa
    data = data.replace(/\\(textbf|superscript|subscript)\{([^\}]+)\}/g, "$2\n");
    //Internal_Bucket {\bf aaaa} => aaaa
    data = data.replace(/\{\\(bf|it|ul)\s+([^\}]+)\}/g, "$2\n");

    //Line indentation
    data = data.replace(/\n{2,}/gm,"~~~~~~~~~~");
    data = data.replace(/\n/gm, " ");
    data = data.replace(/~~~~~~~~~~/gm,"\n\n");
    process.stdout.write(data);
});