...all words that are seperated by space...

Ah... something you didn't mention in your OP.

In this case, you could do: 

while (my $line = <INFILE>) {
    $line =~ s/(\S+)/$dict{$1} || $1/eg;
    print $line;
}

[download]

In case zero is a valid index, too, you'd need 

    $line =~ s/(\S+)/defined $dict{$1} ? $dict{$1} : $1/eg;

[download]

Or, if you're using Perl 5.10, you could write instead 

    $line =~ s|(\S+)|$dict{$1} // $1|eg;

[download]

In reply to Re^3: search and replace by almut
in thread search and replace by Anonymous Monk

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