def getSubString(string, firstChar, secondChar,start=0):
    """
    Gives the substring of string between firstChar and secondChar. Starts looking from start. If it is unable to find a substring returns an empty string.
    """
    front = string.find(firstChar,start)
    back = string.find(secondChar,front+1)
    if front > -1 and back > -1:
        return (string[front+1:back],back)
    else:
        return ("",-1)