[Hampshire] Online regex

Hello penguins,

does anybody know a site where one could put and text some regular
expressions without squeezing one's brain?

Are there any interactive command line applications (shell or perl
scripts) that can help in creating these regex?

Customers are calling me asking to create regex to filter their mail
messages out but I am too lazy to study Perl or regex, I wonder if there
is any such tool.

Thanks.

--
Ottavio