So you want to open a file and print out all lines that only contain one word? If so, this should work:
open FILE, "file.txt" or die $!;
while (<FILE>) {
chomp;
print "$_\n" if $_ =~ /^(\w+)$/;
}
close FILE;
Let me know if you have any questions.
Update: ++'s to tadman for the improvements below.
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