function _ctEscapeHtml(s) {
        return s.replace(/[&<>"']/g, function(c){ return ({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;','''':'&#39;'})[c]; });
    }

    function convert(input) {
        var patternEl = document.getElementById('regex-tester-pattern');
        var flagsEl = document.getElementById('regex-tester-flags');
        var highlightEl = document.getElementById('regex-tester-highlight');
        var pattern = patternEl ? patternEl.value : '';
        var flags = flagsEl ? flagsEl.value : 'g';
        if (flags.indexOf('g') === -1) flags = 'g' + flags;
        if (!pattern) {
            if (highlightEl) highlightEl.innerHTML = _ctEscapeHtml(input || '');
            return '(enter a regex above)';
        }
        var re;
        try { re = new RegExp(pattern, flags); }
        catch (e) {
            if (highlightEl) highlightEl.innerHTML = _ctEscapeHtml(input || '');
            return 'Invalid regex: ' + e.message;
        }
        var lines = [];
        var html = '';
        var lastIndex = 0;
        var count = 0;
        var m;
        re.lastIndex = 0;
        while ((m = re.exec(input || '')) !== null) {
            count++;
            html += _ctEscapeHtml(input.substring(lastIndex, m.index));
            html += '<mark>' + _ctEscapeHtml(m[0]) + '</mark>';
            lastIndex = m.index + m[0].length;
            var line = '#' + count + ' [' + m.index + '..' + (m.index + m[0].length - 1) + ']  ' + JSON.stringify(m[0]);
            for (var g = 1; g < m.length; g++) {
                if (m[g] !== undefined) line += '\n   group ' + g + ': ' + JSON.stringify(m[g]);
            }
            lines.push(line);
            if (m[0].length === 0) re.lastIndex++;
        }
        html += _ctEscapeHtml((input || '').substring(lastIndex));
        if (highlightEl) highlightEl.innerHTML = html || '&nbsp;';
        if (count === 0) return 'No matches.';
        return count + ' match' + (count === 1 ? '' : 'es') + '\n\n' + lines.join('\n\n');
    }

    $(function(){
        $('#regex-tester-pattern, #regex-tester-flags').on('input change', function(){
            $('#box1').trigger('keyup');
        });
    });






var _loadedScripts = {};
function loadScriptPromise(url) {
    if (_loadedScripts[url]) return _loadedScripts[url];
    _loadedScripts[url] = new Promise(function (resolve, reject) {
        var s = document.createElement('script');
        s.src = url;
        s.onload = resolve;
        s.onerror = reject;
        document.head.appendChild(s);
    });
    return _loadedScripts[url];
}

function replaceAll(find, replace, str) {
    return str.replace(new RegExp(find, 'g'), replace);
}

function beautify(str) {


    var result = '';

    var length = str.length;

    var i = 0;

    var braceCountLeft = 0;
    var braceCountRight = 0;

    var withinQuotes = false;

    while (i < length) {

        var c = str[i];

        if (c == '"' && (i == 0 || c[i - 1] != '\\')) {
            // non-escaped quotes
            withinQuotes = !withinQuotes;
        }

        if (!withinQuotes && (c == '}' || c == '{' || c == ',')) {

            console.log('Start####' + result);

            // look back and remove carriage returns and whitespace that are already there

            var resultIndex = result.length - 1;
            while (resultIndex >= 0 && (result[resultIndex] == ' ' || result[resultIndex] == '\r' || result[resultIndex] == '\n' || result[resultIndex] == '\t')) {

                resultIndex = resultIndex - 1;
                result = result.substr(0, resultIndex + 1);

                console.log('char ' + result[resultIndex] + '-----' + result + 'zzz ' + result.length + ' ' + resultIndex);

            }


            if (c == '{') {
                braceCountLeft++;
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            } else if (c == '}') {
                braceCountRight++;
                // precede with carriage return
                result += '\r' + GetTabs(braceCountLeft - braceCountRight) + c;
            } else if (c == ',') {
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            }

            var nextChar = '';

            // advance through whitespace and remove carriage returns that are already there
            while (i < length && (str[i + 1] == ' ' || str[i + 1] == '\r' || str[i + 1] == '\n' || str[i + 1] == '\t')) {
                i++;
            }

        } else {

            result += str[i];

        }


        i++;

    }

    return result;

}

function GetTabs(count) {

    var result = '';

    for (var i = 0; i < count; i++) {
        result += '    ';
    }

    return result;

}