From 396bb28967b040247eea67c92ab7ea47a67a9c62 Mon Sep 17 00:00:00 2001
From: Saria Hajjar <shajjar@mc-lon-mb11797.local>
Date: Wed, 8 Jan 2020 17:28:31 +0000
Subject: [PATCH] Added example and handled invalid ranges gracefully

---
 netbox/utilities/forms.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/netbox/utilities/forms.py b/netbox/utilities/forms.py
index 4cd92ca12..39422c265 100644
--- a/netbox/utilities/forms.py
+++ b/netbox/utilities/forms.py
@@ -65,6 +65,9 @@ def parse_alphanumeric_range(string):
                 values.append(begin)
             # Range-based
             else:
+                # Not a valid range (more than a single character)
+                if not len(begin) == len(end) == 1:
+                    raise forms.ValidationError('Range "{}" is invalid.'.format(dash_range))
                 for n in list(range(ord(begin), ord(end) + 1)):
                     values.append(chr(n))
     return values
@@ -486,6 +489,7 @@ class ExpandableNameField(forms.CharField):
                              'Mixed cases and types within a single range are not supported.<br />' \
                              'Examples:<ul><li><code>ge-0/0/[0-23,25,30]</code></li>' \
                              '<li><code>e[0-3][a-d,f]</code></li>' \
+                             '<li><code>[xe,ge]-0/0/0</code></li>' \
                              '<li><code>e[0-3,a-d,f]</code></li></ul>'
 
     def to_python(self, value):