What does this regexp do?

[Daniel DeLorme]

I can't figure out what this does:

"1\n2\n3\n"[ /.\Z?/ ]

=> ""

I would expect it to output "1", just as:

"1\n2\n3\n"[ /.(\Z)?/ ]

=> "1"

Is this a bug?

 

[Mark Thomas]

I can't figure out what this does:
 >> "1\n2\n3\n"[ /.\Z?/ ]
=> ""

I would expect it to output "1", just as:
 >> "1\n2\n3\n"[ /.(\Z)?/ ]
=> "1"

Is this a bug?

Neither one of those make any sense. An optional end-of-string means
nothing. That second one is the same as [/./]

-- Mark.