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The code invoked the RegExp.prototype.toString or RegExp.prototype.valueOf method on an object of a type other than RegExp. The object of this type of invocation must be of type RegExp.
To correct this error
-
Only invoke the RegExp.prototype.toString or RegExp.prototype.valueOf methods on objects of type RegExp.
See Also
Reference
Regular Expression ObjecttoString Method
valueOf Method
prototype Property
Concepts
Other Resources
Objects (JScript)