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There's Re: Simple primality testing which links to an older node prime factorization using base 1.

Then there's the amazing dc.sed script which implements arbitrary precision numeric calculations in decimal base in sed – you can find its source here or inside the tarball of gnu sed as a test. I don't really understand how it does the multiplication and division, but I could do the addittion on my own in a slightly more complicated way in Re^2: --- adding a column of integers (it's a loop of four substitutions, dc.sed has two and the teasing comment "could be done in one s/// if we could have >9 back-refs..." which I don't really believe).

How about fibonacci numbers? Some snippets like Re: Fibonacci golf with one state variable use regex substitutions but then they're not really using the power of the regex engine. There must be some way to actually use the regular expression engine to generate fibonacci numbers though. Searching yields fibonacci regex and Fibonacci Regex. These test for fibonacci numbers rather than generating them but there's probably some way to convert them. Another idea is to use something like this but probably there's some nicer way to phrase it:

perl -le'$==1,(1x$_)=~/(^)(1|11\1)*(?{$=++})^/,print$=for 0..20'

In reply to Re^2: The Oldest Plays the Piano by ambrus
in thread The Oldest Plays the Piano by casiano

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    [marto]: Corion you under estimate how lazy these admins are :P
    [Discipulus]: we too; using opsview alarms
    [marto]: the key word: outsourcing ;)
    [Corion]: marto: Yeah, feels like that ;) You could set up the cronjob that auto-creates tickets :-))
    [marto]: the ticketing system does not accept calls via email, nor has it a working API. It's tied into Active Directory for authentication and the Solaris boxes aren't on that domain
    [Corion]: The one thing I haven't figured out a solution to is how to get an edge-trigger instead of sending an email every 5 minutes if the usage is above 90%. I want one mail when it goes over 90% but no more emails as long as it stays between 90% and 95%.
    [Corion]: marto: Clever! ;)
    [Corion]: You can only reach me by pager
    [Corion]: Maybe the solution would be to launch a cron job every minute that takes two measurements a minute apart and sends a mail if the usage is below on the first and above threshold on the last measurement
    [marto]: that's essentially it :)

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