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$ perl -wE 'say "aaaab" =~ /(?<=a{1,20})b/'
Variable length lookbehind not implemented in regex m/(?<=a{1,20})b/ a
+t -e line 1.
...
$ blead perl -wE 'say "aaaab" =~ /(?<=a{1,20})b/'
Variable length lookbehind is experimental in regex; marked by <-- HER
+E in m/(?<=a{1,20})b <-- HERE / at -e line 1.
1