Testcase & Output

testcase1:

var a = new RegExp("1");
print(a(1));

output1:

null

testcase2:

var a = new RegExp("1");
print(a(2));

output2:

1

Other JS Engines Output

TypeError: a is not a function.

Rhino Version

1.7.11

Description

In my opinion, a is an Object, not a function. I don't know why rhino can execute these two testcases without throwing an exception and get two different result? Maybe it's a bug? or a feature?

So I need your help. Looking forward to your reply, thanks!