pig latin

import re


def translate1(sentence):
    PIG_LATIN_RE = re.compile(
        r'''
        \b
        (
            [xy][^aeiou]\w*
        |
            [^aeiou\s]*
            (?: (?<=q)u )?
        )
        (\w*)
        \b
        ''', re.VERBOSE)
    return PIG_LATIN_RE.sub(r'\2\1ay', sentence)



def substitute_word(match):
    if re.search(r'^[xy][^aeiou]', match.group(1)):
        return match.group(0) + "ay"
    else:
        return "{1}{0}ay".format(*match.groups())


def translate2(sentence):
    PIG_LATIN_RE = re.compile(
        r'''
        \b
        (
            [^aeiou\s]*
            (?: (?<=q)u )?
        )
        (\w*)
        \b
        ''', re.VERBOSE)
    return PIG_LATIN_RE.sub(substitute_word, sentence)