def _in_tag(text, tag):
    """Extracts text from inside a tag.

    This function extracts the text from inside a given tag.
    It's useful to get the text between <body></body> or
    <pre></pre> when using the validators or the colorizer.
    """
    if text.count('<%s' % tag):
        text = text.split('<%s' % tag, 1)[1]
        if text.count('>'):
            text = text.split('>', 1)[1]
    if text.count('</%s' % tag):
        text = text.split('</%s' % tag, 1)[0]

    text = text.strip().replace('\r\n', '\n')

    return text