import re

def blockquote(data):
    while 1:
        m = re.search("\n>\s?((?:[^\n]*)(?:(?:(?:(?:\n>\s?)(?:[^\n]*))+)?))", data)
        if m:
            result = m.groups()
            blockquote = result[0]
            blockquote = re.sub("\n>\s?", "\n", blockquote)
            data = re.sub("\n&gt;\s?((?:[^\n]*)(?:(?:(?:(?:\n&gt;\s?)(?:[^\n]*))+)?))", "\n<blockquote>" + blockquote + "</blockquote>", data, 1)
        else:
            break

    return data