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JavaScript

var regex1 = /a|b/g; 
function isAB1() { 
     return regex1.test('a'); 
} 
console.log(isAB1()); // true
console.log(isAB1()); // false
console.log(isAB1()); // true
console.log(isAB1()); // false

var regex2 = /a|b/g; 
function isAB2() { 

    return regex2.test('a'); 
} 
console.log(isAB2()); // true
console.log(isAB2()); // true
console.log(isAB2()); // true
console.log(isAB2()); // true