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$ perl -MYAPE::Regex::Explain -e " print YAPE::Regex::Explain->new( qr
+{\A ipv6 | alt \Z}imxs )->explain "
The regular expression:

...
----------------------------------------------------------------------
)                        end of grouping
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[Visual of regex at 'rxrx' line 0]         [step: 5]

    \A                    Match only if at start of string
...