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Document @(code) interpolation in regex #3317

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Document @(code) interpolation in regex #3317

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Document @(code) interpolation in regex
Apr 7, 2020
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fixup! Document @(code) interpolation in regex
Apr 8, 2020
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12 changes: 12 additions & 0 deletions doc/Language/regexes.pod6
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Expand Up @@ -1894,6 +1894,9 @@ pattern, which may be summarized as follows:

=end table

Instead of the C<$> sigil, you may use the C<@> sigil for array interpolation.
See below for how this works.

X<|regex, $variable>X<|regex, $(code)>
Let's start with the first two syntactical forms: C«$variable» and C«$(code)».
These forms will interpolate the stringified value of the variable or the
Expand Down Expand Up @@ -2017,6 +2020,15 @@ regexes. Just as with ordinary C<|> interpolation, the longest match succeeds:
my @a = '2', 23, rx/a.+/;
say ('b235' ~~ / b @a /).Str; # OUTPUT: «b23»

If you have an expression that evaluates to a list, but you do not want to
assign it to an @-sigiled variable first, you can interpolate it with
C<@(code)>. In this example, both regexes are equivalent:

my %h = a => 1, b => 2;
my @a = %h.keys;
say S:g/@(%h.keys)/%h{$/}/ given 'abc'; # OUTPUT: «12c>
say S:g/@a/%h{$/}/ given 'abc'; # OUTPUT: «12c>

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The use of hashes in regexes is reserved.

=head2 Regex boolean condition check
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