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Re: Re: Re: Weird "soundex" algorithm

by broquaint (Abbot)
on Aug 28, 2003 at 23:58 UTC ( #287556=note: print w/replies, xml ) Need Help??

in reply to Re: Re: Weird "soundex" algorithm
in thread Weird "soundex" algorithm

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.


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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.

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