Allow regex to allow empty fields

[jsnell@…]

This diff will allow the regex to allow for an empty field or a match.

Then, if a value is always required a rule with .+ instead of .* could be used instead.

ticketvalidator.py

@@ -82 +82 @@
             fieldValue = req.args.get(field)
 
         if fieldValue is not None:
-            if not fieldValue or (rule and re.match(rule, fieldValue) is None):
+            if (rule and re.match(rule, fieldValue) is None):
                 return errorMessage
 
     def _isValidateEmail(self, email):

[Ryan J Ollos]

In 17288:

TracTicketValidator 0.5: Allow empty or match

Patch by jsnell@…

Fixes #13473.