diff --git a/src/core/io.coffee b/src/core/io.coffee
index 512672ab..8b35d030 100644
--- a/src/core/io.coffee
+++ b/src/core/io.coffee
@@ -1,7 +1,7 @@
 # Various I/O based operations
 class Caman.IO
   # Used for parsing image URLs for domain names.
-  @domainRegex: /(?:(?:http|https):\/\/)((?:\w+)\.(?:(?:\w|\.)+))/
+  @domainRegex: /(?:(?:http|https):\/\/)((?:[a-zA-Z0-9_-]+)\.(?:(?:[a-zA-Z0-9_-]*|\.)+))/;
 
   # Is the given URL remote?
   # If a cross-origin setting is set, we assume you have CORS
@@ -110,4 +110,4 @@ Caman::toBase64 = (type = "png") ->
     type = type.toLowerCase()
     return @canvas.toDataURL "image/#{type}"
 
-IO = Caman.IO
\ No newline at end of file
+IO = Caman.IO