Re: Weird "soundex" algorithm

sub weirdex {
  local $_ = shift;

  tr/a-zA-Z//dc;
  tr/a-zA-Z//s;
  m/[aeiou]/g and substr($_, pos) =~ s/[aieuo]//g;

  $_;
}

print "$_ - ", weirdex($_), $/
  for "giulienk", "larry wall", "etheroskedasticity";

__output__

giulienk - gilnk
larry wall - larywl
etheroskedasticity - ethrskdstcty
[download]

tr//, m// and s///, pos and substr are your friends :)
HTH

_________ broquaint

Comment on Re: Weird "soundex" algorithm Download Code

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Re: Re: Weird "soundex" algorithm by giulienk (Curate) on Aug 28, 2003 at 15:32 UTC
Thanks to yours and jmcnamara's reply: i totally forgot about the power of tr/// modifiers, especially `c` and `s`, which i never used before. :) `$\|=$_="1g2i1u1l2i4e2n0k",map{print"\7",chop;select$,,$,,$,,$_/7}m{..}g`	[reply]
Re: Re: Weird "soundex" algorithm by diotalevi (Canon) on Aug 28, 2003 at 19:10 UTC
Nice. I was unhappy with your vowel stripping though. You use a looping match for offsets into $_ but really, you only have to find the first vowel and then no looping is required. `# m/[aeiou]/g and substr($_, pos) =~ s/[aieuo]//g; /[aeiou]/ and substr( $_, $+[0] ) =~ tr/aeiou//d;` [download]	[reply] [d/l]
Re: Re: Re: Weird "soundex" algorithm by broquaint (Abbot) on Aug 28, 2003 at 23:58 UTC
You use a looping match for offsets into $_ but really ... Er, what looping? The `/g` matches the first vowel then saves the position of the match for `substr` which the replace then operates on. I didn't want to use the `$+` variable because of the overhead it invokes. HTH `_________ broquaint`	[reply]
Re: Re: Re: Re: Weird "soundex" algorithm by diotalevi (Canon) on Aug 29, 2003 at 01:53 UTC
Er... what overhead? You mean of making an array access because that's all it is. @+ and @- don't invoke the $`, $& and $' penalties. Those arrays are just offsets into the string. `$-[0]` is the offset of the beginning of the string and `$+[0]` is the offset of the end of the string. Using those doesn't prompt perl to do all the copying that capturing, $`, $&, and $' do. Its just not the same thing. Granted, I did miss that scalar /g loops only once and in this usage that'd be the only loop ever used. I find myself avoiding pos() after learning that it doesn't survive a local() on the variable in question. That's just style though.	[reply] [d/l] [select]