diff --git a/rest_framework/templatetags/rest_framework.py b/rest_framework/templatetags/rest_framework.py
index 83c046f99..7a70fd460 100644
--- a/rest_framework/templatetags/rest_framework.py
+++ b/rest_framework/templatetags/rest_framework.py
@@ -6,7 +6,7 @@ from django.utils.encoding import iri_to_uri
 from django.utils.html import escape
 from django.utils.safestring import SafeData, mark_safe
 from rest_framework.compat import urlparse, force_text, six, smart_urlquote
-import re, string
+import re
 
 register = template.Library()
 
@@ -185,7 +185,7 @@ WRAPPING_PUNCTUATION = [('(', ')'), ('<', '>'), ('[', ']'), ('&lt;', '&gt;'),
                         ('"', '"'), ("'", "'")]
 word_split_re = re.compile(r'(\s+)')
 simple_url_re = re.compile(r'^https?://\[?\w', re.IGNORECASE)
-simple_url_2_re = re.compile(r'^www\.|^(?!http)\w[^@]+\.(com|edu|gov|int|mil|net|org)$', re.IGNORECASE)
+simple_url_2_re = re.compile(r'^www\.|^(?!http)\w[^@\[\]]+\.(com|edu|gov|int|mil|net|org)$', re.IGNORECASE)
 simple_email_re = re.compile(r'^\S+@\S+\.\S+$')
 
 
@@ -211,7 +211,6 @@ def urlize_quoted_links(text, trim_url_limit=None, nofollow=True, autoescape=Tru
     safe_input = isinstance(text, SafeData)
     words = word_split_re.split(force_text(text))
     for i, word in enumerate(words):
-        match = None
         if '.' in word or '@' in word or ':' in word:
             # Deal with punctuation.
             lead, middle, trail = '', word, ''