Hello,

I have the following problem when trying to use the validator. I have
a field
which should have an entry with the following pattern:

dddd.d+ (4 digits followed by a dot followed by 1 or more digits)

Optionally the field can be empty. Note that strings consisting only
of WHITESPACE are not accepted!

Ok, using the following link I tested two regular expressions that do
what I want:
http://jakarta.apache.org/oro/demo.html

Both of these work:
^(\A\Z)|(\d{4}\.\d+)$
^(^$)|(\d{4}\.\d+)$

Now, if I put either of them in my validation.xml file:

<constant-value>^(^$)|(\d{4}\.\d+)$</constant-value>
<constant-value>^(\A\Z)|(\d{4}\.\d+)$</constant-value>

It doesn't work as expected. It happens that strings consisting only
of whitespace are accepted!

So do you have any clues?

Thanks,

Roland