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perlif-statementconditional-statements

Invert a condition in Perl

I want to match on fieldA and everything in fieldB as long as it isn't 456:

if ($fieldA==123 && $fieldB!==456)

What is the syntax I should use for fieldB? Is it !== or !=? I've also seen something like !$fieldB==456. It's really the syntax of fieldB that I'm having issues with.

Solution

  • In general you want to use

    if ($fieldA == 123 && $fieldB != 456)

    If you wanted to negate both you could use the form

    unless ($fieldA == 123 && $fieldB == 456)

    Which would evaluate to true if both assertions were false.