String REGEX = "\"([^\"]*)\"";

                String sentence = "World \"Hello\" World!";
                
                Pattern pattern = Pattern.compile(REGEX);
            Matcher matcher = pattern.matcher(sentence);
                
            if(matcher.find()){
                String result = matcher.group(1);
                System.out.println(result);
            } else {
                        System.out.println("Nothing");
            }

public static class StringExtentions
{
        public static String Format(this String str, params Object[] args)
        {
                return String.Format(str, args);
        }

        public static String Format(this String str, IFormatProvider provider, params Object[] args)
        {
                return String.Format(provider, str, args);
        }
}

string GetBetween(string target, string left, string right)
{
        size_t begin = target.find(left);
        size_t end = target.find(right);
        if(begin==string::npos || end==string::npos) return "";
        begin += left.size();
        return target.substr(begin, end - begin);
}

function IsEmail(email) {
    var regex = /^([a-zA-Z0-9_\.\-\+])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
    return regex.test(email);
}

function makeClickable($text) {
    $text = preg_replace("/(^|[\n ])([\w]*?)((ht|f)tp(s)?:\/\/[\w]+[^ \,\"\n\r\t<]*)/is", "$1$2$3", $text);
    $text = preg_replace("/(^|[\n ])([\w]*?)((www|ftp)\.[^ \,\"\t\n\r<]*)/is", "$1$2$3", $text);
    $text = preg_replace("/(^|[\n ])([a-z0-9&\-_\.]+?)@([\w\-]+\.([\w\-\.]+)+)/i", "$1$2@$3", $text);
    return($text);
}

function FormatByteSize(const bytes: Longint): string;
const
  B = 1; //byte
  KB = 1024 * B; //kilobyte
  MB = 1024 * KB; //megabyte
  GB = 1024 * MB; //gigabyte
begin
  if bytes > GB then
    result := FormatFloat('#.## Gb', bytes / GB)
  else if bytes > MB then
    result := FormatFloat('#.## Mb', bytes / MB)
  else if bytes > KB then
    result := FormatFloat('#.## Kb', bytes / KB)
  else
    result := FormatFloat('#.## bytes', bytes);
end;

function ReplaceSub(str, sub1, sub2: string): string;
var
  aPos: Integer;
  rslt: string;
begin
  aPos := pos(sub1, str);
  rslt := '';
  while (aPos <> 0) do
  begin
    rslt := rslt + Copy(str, 1, aPos - 1) + sub2;
    Delete(str, 1, aPos + Length(sub1) - 1);
    aPos := pos(sub1, str);
  end;
  result := rslt + str;
end;

procedure TForm1.btn1Click(Sender: TObject);
var
  my_str: string;
begin
  my_str := 'My cool string is very cool!';
  ShowMessage(ReplaceSub(my_str, 'cool', 'awesome'));
end;

function byte_format($num) {
    if ($num >= 1000000000000) {
        $num = round($num / 1099511627776, 1);
        $unit = "Tb";
    } elseif ($num >= 1000000000) {
        $num = round($num / 1073741824, 1);
        $unit = "Gb";
    } elseif ($num >= 1000000) {
        $num = round($num / 1048576, 1);
        $unit = "Mb";
    } elseif ($num >= 1000) {
        $num = round($num / 1024, 1);
        $unit = "Kb";
    } else {
        $unit = "Bytes";
        return number_format($num) . ' ' . $unit;
    } return number_format($num, 1) . ' ' . $unit;
}

function generatePassword($length = 8) {
    $chars = 'abdefhiknrstyzABDEFGHKNQRSTYZ23456789';
    $numChars = strlen($chars);
    $string = '';
    for ($i = 0; $i < $length; $i++) {
        $string .= substr($chars, rand(1, $numChars) - 1, 1);
    }
    return $string;
}