[xsl] xslt 2.0 regex and how to test it

["Manfred Staudinger" <manfred.staudinger@xxxxxxxxx>]

Hi list,
Up to now, I've done this by recursion, but thought its about time
to learn regex and use replace:

I would like to eliminate substrings starting and ending with
square-brackets,
for example "[abc, 1954-57]" should be replaced by "" (null-string).
What is the regex for this to match?

How do you recommend to test xslt regex? Is it possible to
to see what is actually matched?

Regards, Manfred