Definitely adding this to my snippet file! But I've never seen this syntax before.

@{[]} is the famous Baby Cart Secret Operator.

I must say I'm shocked LanX didn't mention his visualization of this operator, namely "a guy with sombrero dragging a sled(ge) uphill" ... which is why he usually refers to it as the Mexican Sledge operator.

See also: Secret Operator References

In reply to Re^5: Check if key exist in hash but not exact match by eyepopslikeamosquito
in thread Check if key exist in hash but not exact match by Anonymous Monk

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