--- a/src/pyams_utils/tales.py	Thu Jun 02 16:40:39 2016 +0200
+++ b/src/pyams_utils/tales.py	Thu Jun 02 16:41:14 2016 +0200
@@ -41,11 +41,12 @@
 
 
 FUNCTION_EXPRESSION = re.compile('(.+)\((.+)\)')
-ARGUMENTS_EXPRESSION = re.compile('[\'\"\w\.\+@]+')
+ARGUMENTS_EXPRESSION = re.compile('[^(,)]+')
 
 
 def get_value(econtext, arg):
     """Extract argument value from context"""
+    arg = arg.strip()
     if arg.startswith('"') or arg.startswith("'"):
         # may be a quoted string...
         return arg[1:-1]