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--- a/ForgeSVN/forgesvn/widgets.py
+++ b/ForgeSVN/forgesvn/widgets.py
@@ -1,3 +1,5 @@
+import re
+
 from formencode import validators as fev
 
 import ew as ew_core
@@ -5,8 +7,20 @@
 
 from allura.lib.widgets.forms import ForgeForm
 
+class ValidateSvnUrl(fev.URL):
+    url_re = re.compile(r'''
+        ^(http|https|svn)://
+        (?:[%:\w]*@)?                              # authenticator
+        (?P<domain>[a-z0-9][a-z0-9\-]{,62}\.)*     # subdomain
+        (?P<tld>[a-z]{2,63}|xn--[a-z0-9\-]{2,59})  # top level domain
+        (?::[0-9]{1,5})?                           # port
+        # files/delims/etc
+        (?P<path>/[a-z0-9\-\._~:/\?#\[\]@!%\$&\'\(\)\*\+,;=]*)?
+        $
+    ''', re.I | re.VERBOSE)
+
 class ImportForm(ForgeForm):
     submit_text='Import'
     class fields(ew_core.NameList):
         checkout_url = ew.TextField(label='Checkout URL',
-                                    validator=fev.URL())
+                                    validator=ValidateSvnUrl(not_empty=True))