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regex not something

// You can use (?!...) like the example below

let names = ['JOAO', 'JOHN', 'JOANA', 'JOABE'];
for(let n of names)
{
  	/(JO)(?!A)/.test(n);
	// only true on 'JOHN'
}
Comment

regex not a value

^((?!hede).)*$
Comment

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