Using JavaScript in a filter field

[xiaix]

In my users table (sys_user), I'd like to do this:

(looking for records where first name only contains letters (a-z), and hyphens/dashes)

When I run this, it seems to work because it returns fewer records than if no filter were applied.

However, I'm not convinced it's working as I'm expecting because when I do this:

0 records are shown.

[Gosia Urbanska]

You can use Script include;

Remove all default code from a script and add you function;

name of script and function should be the same also Client callable set to true