linkify phone numbers in coffeescript

linkify.coffee

s = """
Extensions are not supported.
Alphabetic phonenumbers eg 1888-FOR-RILZ are not supported.
Of course, you'll want to prevent injection by stripping html tags first.
It switches the numbers to international format (or sth) - suggestions welcome!

706 555 5001put some
ill formed(404) 555-1397text in here
+34712938479 to make it interesting...5
404.555.1239.

1-234-567-8901
1-234-567-8901 x1234
1-234-567-8901 ext1234
1 (234) 567-8901
1.234.567.8901
1/234/567/8901 # this one will not work, who does that anyways?
it would catch stuff like 2012/12/21/5/10/45 and such

we don't want to catch
http://sth.com/23458029340940920349.html

we do want to catch <p>706 3384109</p>

12345678901

hrm, but might it catch a copyright year range?
this one, no, not enough characters:
1999-2008
weeded out for consecutive non-numeric:
1990 - 2010
2009- 2010

GO FORTH AND FIND THE EDGE CASES!
"""

window.telephone_linkify = (str) ->
  re = /[\s|>][0-9\(\)\+\-][0-9\(\)\+ \-\.]{8,15}[0-9]/gm
  matches = str.match(re)

  if matches
    idx = 0

    for match in matches
      # this is where we weed out matches that
      # shouldn't be phone numbers, hrm ...
      if match.match(/[\(\)\+ \-\.\>]{3}|[\+ \-\.\>]{2}/)
        continue

      done = str.slice(0, idx)
      left = str.slice(idx, str.length)

      newstr = match.replace(/\(|\)|\+| |\-|\.|\>/g, "")
      replacement = "<a href='tel:+#{newstr}'>#{newstr}</a>"
      idx = (str.indexOf match) + 1 + replacement.length

      newleft = left.replace(match.slice(1, match.length), replacement)
      str = done + newleft
  str




alert telephone_linkify(s)

this is borked, md5 hashes can get identified as phone numbers ;/