2.8.8.1 options

The value of the options property is a string that specifies the values of the global, ignoreCase, and multiline properties of this RegExp instance. If the value of the ignoreCase property is true, the string contains the character "i". If the value of the global property is true, the string contains the character "g". If the value of the multiline property is true, the string contains the character "i". When present, the characters appear in the order "igm". If all of the global, ignoreCase, and multiline properties have the value false, the value of this property is the empty string. This property shall have the attributes { [[Enumerable]]: false, [[Configurable]]: false, [[Writable]]: false }.