Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked
 
PerlMonks  

Re: Challenge - Creative Way To Detect Alpha Characters

by premchai21 (Curate)
on Sep 15, 2004 at 23:13 UTC ( #391322=note: print w/ replies, xml ) Need Help??


in reply to Challenge - Creative Way To Detect Alpha Characters

Highly ASCII-specific, and inefficient, but perhaps mildly interesting. Appears to work, though no absolute guarantees are made of course. Using tr/// is kind of a wart, though, hmm.

sub contains_alpha { use bytes; my ($string) = @_; my $len = length($string .= ""); my @b = map{$string & (chr(1<<$_) x $len)} (0..7); tr/\x01-\xff/\x01/ for @b; my $result = (~$b[7]) & ($b[6]) & (($b[4] & ~($b[3] & (($b[1] & $b[0]) | $b[2]))) | ((~$b[4]) & ($b[3] | $b[2] | $b[1] | $b[0]))) ; $result =~ tr/\x00//d; length($result); }


Comment on Re: Challenge - Creative Way To Detect Alpha Characters
Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://391322]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others cooling their heels in the Monastery: (5)
As of 2015-07-04 10:17 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (59 votes), past polls