replace.py

import os, re, requests
rootdir = '_posts'

for subdir, dirs, files in os.walk(rootdir):
    for file in files:
        filename = os.path.join(subdir, file)

        print filename

        f = open(filename, "r")
        contents = f.read()
        f.close()

        contents = re.sub('\[video.*?type="vimeo".*?clip_id="(.*?)".*?\]', '<iframe src="//player.vimeo.com/video/\\1?title=0&amp;byline=0" width="500" height="281" frameborder="0"> </iframe>', contents)
        contents = re.sub('\[video.*?type="youtube".*?clip_id="(.*?)".*?\]', '<iframe width="560" height="315" src="http://www.youtube.com/embed/\\1" frameborder="0"> </iframe>', contents)

        f = open(filename, "w")
        f.write("".join(contents))
        f.close()