regex negation Code Answer’s
The negation of a regular expression is a way to tell the regular expression parser that it does not match anything. The simplest way to do this is by enclosing the negated pattern within parentheses: (?!) which is called "unanchored". This also means that this pattern can be used inside other patterns, such as alternation and grouping.
regex negate
By 
DeuxAlpha
on Feb 10, 2020
DeuxAlpha
on Feb 10, 2020
^(?!.*bar).*$
serial_number: [^((?!null).)*$]+Source: stackoverflow.com
1
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