From @masak

<masak> rakudo​: say "_block".trans(/foo/ => "bar")
<p6eval> rakudo 015d77​: OUTPUT«barbar␤»
<masak> how barbaric.
* masak submits rakudobug
<masak> S05​:4173​: "To achieve greater power, any recognition element
of the left side may be specified by a regex that can do character
classes, lookahead, etc."
<masak> I see no sign in the Rakudo source code that Str.trans takes
regexes into account, so I'll make this a TODO ticket.
<masak> the output above is entirely spurious.

From @felliott

Hello,

This works in current rakudo and has tests in
S05-transliteration/trans.t. I think this can be marked as resolved.

Cheers,
Fitz Elliott

@masak - Status changed from 'new' to 'resolved'