old_contents: from django import template
  from django.contrib.auth.models import User
  from django.utils.safestring import mark_safe
  import re
  import urllib
  
  register = template.Library()
  
  username_re = re.compile('@[0-9a-zA-Z]+')
  hashtag_re = re.compile('(?:^|\s)(#\S+)')
  
  @register.filter
  def buglise(s):
      s = unicode(s)
      
      usernames = set(User.objects.values_list('username', flat=True))
      def replace_username(match):
          username = match.group(0)[1:]
          if username.lower() == 'all':
              return '<strong>@all</strong>'
          if username in usernames:
              return '<a href="/%s/">@%s</a>' % (username, username)
          else:
              return '@' + username
      
      s = username_re.sub(replace_username, s)
  
      s = hashtag_re.sub(
          lambda m: '<a href="/search/?q=%s">%s</a>' % (
              urllib.quote(m.group(0)), 
              m.group(0),
          ),
          s
      )
      return mark_safe(s)
      
  
new_contents: from django import template
  from django.contrib.auth.models import User
  from django.utils.safestring import mark_safe
  import re
  import urllib
  
  register = template.Library()
  
  username_re = re.compile('@[0-9a-zA-Z]+')
  hashtag_re = re.compile('(^|\s)(#\S+)')
  
  @register.filter
  def buglise(s):
      s = unicode(s)
      
      usernames = set(User.objects.values_list('username', flat=True))
      def replace_username(match):
          username = match.group(0)[1:]
          if username.lower() == 'all':
              return '<strong>@all</strong>'
          if username in usernames:
              return '<a href="/%s/">@%s</a>' % (username, username)
          else:
              return '@' + username
      
      s = username_re.sub(replace_username, s)
  
      s = hashtag_re.sub(
          lambda m: '%s<a href="/search/?q=%s">%s</a>' % (
              m.group(1),
              urllib.quote(m.group(2)), 
              m.group(2),
          ),
          s
      )
      return mark_safe(s)
      
  
subject: Remove spaces from hash tag links