filter tweet django templatetag

twitter_extras.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import re
from django.utils.safestring import mark_safe
from django import template

register = template.Library()

@register.filter(name='twitter_tags')
def twitter_tags(value):
    value = re.sub(r'((mailto\:|(news|(ht|f)tp(s?))\://){1}\S+)', '<a href="\g<0>" rel="external">\g<0></a>', value)
    value = re.sub(r'#(?P<hashtag>\w+)', '<a href="https://twitter.com/search?q=\g<hashtag>&src=typd&f=realtime" rel="external">#\g<hashtag></a>', value)
    value = re.sub(r'@(?P<username>\w+)', '@<a href="https://twitter.com/\g<username>/" rel="external">\g<username></a>', value)

    return mark_safe(value)