String comparison

For comparing strings, you can use

• eq: equality
• ne: non-equality
• cmp: returns -1, 0, or 1, depending on if the left argument is string-wise less than, equal to, or greater than the right argument.

Note that string comparisons respect the case - a string $var1 = 'NO' is not equal to a variable $var2 = 'no'. If you want to compare two strings and not worry about the case, the operators uc (for converting a string to all upper-case) and lc (for converting a string to all lower-case) may be useful:

my $answer = 'YES';
if (lc $answer eq 'yes') {
  print "You answered in the affirmative";
}