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Re^3: transliterate a sub-string

by Anonymous Monk
on Jan 16, 2013 at 09:05 UTC ( #1013535=note: print w/ replies, xml ) Need Help??

in reply to Re^2: transliterate a sub-string
in thread transliterate a sub-string

as explicitely said in its perldoc:

Said and shown :)

my $name = 'fred'; substr($name, 4) = 'dy'; # $name is now 'freddy' my $null = substr $name, 6, 2; # returns "" (no warning) my $oops = substr $name, 7; # returns undef, with warning substr($name, 7) = 'gap'; # raises an exception

Note that the lvalue returned by the three-argument version of substr() acts as a 'magic bullet'; each time it is assigned to, it remembers which part of the original string is being modified; for example:

$x = '1234'; for (substr($x,1,2)) { $_ = 'a'; print $x,"\n"; # prints 1a4 $_ = 'xyz'; print $x,"\n"; # prints 1xyz4 $x = '56789'; $_ = 'pq'; print $x,"\n"; # prints 5pq9 }

Wow, I can copy/paste :)

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