I’ve just released version 1.00 of my Text::Match::FastAlternatives
Perl module. Since I’m apparently declaring it stable, I thought it was
worth writing up a description of what it does, and how it does it.
Suppose you have a large list of strings, and a set of keys, and you need to
determine, for each of the strings, whether any of the keys occur in it.
For example, the list of strings might be a list of user-agent headers sent
to a web server, and the keys a set of strings that are good indicators of
robots accessing your site; you want to calculate some server statistics,
but disregard any robotic traffic.
How do you go about doing that?