Looks like 5.10 according to perl5100delta:
Relative backreferences
A new syntax "\g{N}" or "\gN" where "N" is a decimal integer a
+llows
a safer form of back-reference notation as well as allowing re
+lative
backreferences. This should make it easier to generate and emb
+ed
patterns that contain backreferences. See "Capture buffers" in
perlre. (Yves Orton)
The cake is a lie.
The cake is a lie.
The cake is a lie.
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