This has nothing to do with non-capture mode.

The capture variables $1 and so on only hold the value of the last successful pattern match, and I guess the logic of non-capture mode only comes after the logic that resets $1 on a successful match. See perlvar for $1, where the behaviour of resetting $1 etc. is discussed.

In reply to Re: non-capture mode sometimes erases previous capture by Corion
in thread non-capture mode sometimes erases previous capture by raygun

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