Problem with combination of sticky and global flags in regexp

[andreabergia]

The following script is the output from nodeJS:

> var re = /[abc]/gy
undefined
> re.exec('ab-c')
[ 'a', index: 0, input: 'ab-c', groups: undefined ]
> re.exec('ab-c')
[ 'b', index: 1, input: 'ab-c', groups: undefined ]
> re.exec('ab-c')
null

However, when the same is executed in rhino, there is an additional (incorrect) match on c.