substitute/regex etc

how can i substitute, or remove anything that's not an alphanumerical
character in a string?

i.e:
$string = "AbCdEF1246Hfn \n";
$string =~ s/[^a-z][^A-Z][^0-9]//g;

though to me, that would say:
(replace anything that's not a lower case letter as the first char) then
(replace anything that's not an upper case letter as the second char) then
(rpelace anything that's not a number as the third char).

or is this right?

thanks, dan


.

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