(Mnemonic: like \digits)

Try it like this: \(&mysub(<$1> <$2>)); 

#!/usr/bin/perl -slw

use strict;
use re 'debug';

sub mysub {
    die 'single word expected' if (my $name = shift @_)  =~ /^\w+$/;
    die 'single word expected' if (my $value = shift @_) =~ /^\w+$/;
}

my $str = 'abc def';
$str =~ /(\w+)\s+(\w+)/;
print "\(&mysub(<$1> <$2>))";

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In reply to Re: unexpected: inside sub($1,$2) if do // then arguments will be changed by Khen1950fx
in thread unexpected: inside sub($1,$2) if do // then arguments will be changed by bdimych

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