get video links in coffeescript
regex_findall = (regex, s) ->
# str = 'I learned to play the Ukulele in Lebanon.'
# regex = /le/gi
result = undefined
indices = []
while result = regex.exec(s)
if result.length > 0
indices.push result[0]
indices
get_video_links = (s) ->
regex = /[A-Za-z0-9\.\/\:]{1,}\.mp4/g
regex_findall(regex, s)