d5a00e4af introduced a bug in reginsert that was fixed by
da7cf1cc7,
originally documented in [perl #128109]. This patch adds two
regression tests for the testcase reported by Jan Goyvaerts in
[perl #128420].
.{1}?? - c - Nested quantifiers
.{1}?+ - c - Nested quantifiers
(?:.||)(?|)000000000@ 000000000@ y $& 000000000@ # [perl #126405]
+aa$|a(?R)a|a aaa y $& aaa # [perl 128420] recursive matches
+(?:\1|a)([bcd])\1(?:(?R)|e)\1 abbaccaddedcb y $& abbaccaddedcb # [perl 128420] recursive match with backreferences
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