Beefy Boxes and Bandwidth Generously Provided by pair Networks
Think about Loose Coupling
 
PerlMonks  

Re: Regular Expression Builder

by tommyw (Hermit)
on Aug 30, 2002 at 15:36 UTC ( #194145=note: print w/replies, xml ) Need Help??


in reply to Regular Expression Builder

Programming Perl includes:

#!/usr/bin/perl $vowels='aeiouy'; $cons='bcdfghjklmnpqrstvwxzy'; %map={C=>$cons, V=>$vowels; for $class=($vowels, $cons) { for (split //, $class) { map{$_}.=$class; } } for $char (split //, shift) { $pat.="[$map{$char}]"; } $re=qr/^${pat}$/i; print "REGEX is $re\n"; @ARGV='/usr/dict/words' if -t && !@ARGV; while (<>) { print if /$re/; }
Which takes a word, and builds a template from it with the same pattern of vowels and consonants. Although the original is commented. Extending this to handle digits should be easy. The cunning part will be collapsing the multiple character classes down, and using a multiple instead.

This is, of course, left as an exercise for the reader ;-)

--
Tommy
Too stupid to live.
Too stubborn to die.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://194145]
help
Chatterbox?
[ambrus]: erix: that one actually sucks. these days people should get rid of the old notion that TeX is the only thing you can use for decent mathematics writing, because MS Office and LibreOffice have reached the
[ambrus]: level where people can more easily write as good mathematical papers in them as the people who write bad LaTeX papers usually write.
[ambrus]: Yes, for like the first twenty of its years, TeX was basically the only system that allowed you to write decent maths papers, and C++ and PHP were programming languages that sucked, etc. But times change and people have to accept that.
Discipulus bad people + good tool < normal people + decent tool
[Discipulus]: php does not suck anymore?

How do I use this? | Other CB clients
Other Users?
Others chanting in the Monastery: (10)
As of 2017-09-26 11:04 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    During the recent solar eclipse, I:









    Results (293 votes). Check out past polls.

    Notices?