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[dirk]

Bompa,

the empty curly braces {} mean that the string in the preceeding curly braces
shall be replaced by nothing. So the special characters will be deleted.

Dirk

[Bompa]

Bompa,

the empty curly braces {} mean that the string in the preceeding curly braces
shall be replaced by nothing. So the special characters will be deleted.

Dirk

ahhh, I finally get it. 

Bompa <--- SLOW

You have an extra curly brace cuz YOU HAVE TO in order to have braces in pairs,
whereas, if we delimit with slashes, we can use jut three.

damn!

[dirk]

Bompa,

here are some more examples:

Code:

$string =~ s/[^\x00-\x7E]//;
$string =~ s|[^\x00-\x7E]||;
$string =~ s~[^\x00-\x7E]~~;

$string =~ s([^\x00-\x7E])();
$string =~ s[[^\x00-\x7E]][];
$string =~ s{[^\x00-\x7E]}{};

Normally only three delimiters are required.

But if you use brackets you need 4 (two pairs).