It's not documented in perlre because perlre is ridiculously pedantic. The /e doesn't modify the regular expression; it modifies the replacement text.

perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

In reply to Re^3: Oneliner with substring trimming and padding by tobyink
in thread Oneliner with substring trimming and padding by Neighbour

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