How to determine if an object is a RegExp object?

Question

Possible duplicate:
typeof for RegExp

I have a procedure that checks if an object meets the given criteria.

testForMatch(objectToTest, matchCriteria) { // all my testing logic here. } 

The matchCriteria parameter is an object that might look like this:

 { 'size' : "large", 'color' : /(blue|red)/ } 

This matchCriteria in the above example will be used to check whether the objectToTest has a objectToTest attribute with a value of "large" and a color attribute with a value of either "blue" or "red" .

So matchCriteria has the property / attribute names that will be searched in objectToTest for the purpose of matching property values. Or, if a regular expression is specified as the value (as is the case with color above), the property in objectToTest will have the value RegExp.test() for the given regular expression.

But in order to correctly examine matchCriteria in testForMatch() I need to determine if the attribute value in matchCriteria string or a RegExp object.

My question is how to determine if the value of the RegExp attribute is an object?

Answer 1

What about

 var o = { 'size' : "large", 'color' : /(blue|red)/ } print (o['color'] instanceof RegExp) >>true