Re: Re: Difference between tr// and s///?

Notice there's a space between the second and third slash in the OP's code example. With proper code tags you can see more clearly:

$toto = 'this+is+my+text';
$toto =~tr/+/ /;
why not $toto =~s/\+/ /g; ?
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Re: Difference between tr// and s///? by Abigail-II (Bishop) on Feb 06, 2004 at 11:36 UTC
Ah, yes, I didn't realize that originally the OP didn't use `<code>` tags, so I didn't notice the space. My second point still stands though, `tr///` is usually faster than `s///`. It is faster because `tr///` is a much simpler operation. It's a character by character replacement - no copy of the string needs to be made, nor do large parts of the string be moved. An `s///` operation cannot assume such a thing, replacement parts can be shorter or smaller than the thing that needs to be replaced. Abigail	[reply] [d/l] [select]

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Re: Difference between tr// and s///?
by Abigail-II (Bishop) on Feb 06, 2004 at 11:36 UTC

<code>

My second point still stands though, tr/// is usually faster than s///. It is faster because tr/// is a much simpler operation. It's a character by character replacement - no copy of the string needs to be made, nor do large parts of the string be moved. An s/// operation cannot assume such a thing, replacement parts can be shorter or smaller than the thing that needs to be replaced.

Abigail

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