Combining regexes using a loop in Perl 6

Question

Here I make a regex manually from Regex elements of an array.

my Regex @reg =
  / foo /,
  / bar /,
  / baz /,
  / pun /
  ;

my $r0 = @reg[0];
my $r1 = @reg[1];

my Regex $r = / 0 $r0 | 1 $r1 /;

"0foo_1barz" ~~ m:g/<$r>/;
say $/;  # (｢0foo｣ ｢1bar｣)

How to do it with for @reg {...}?

Answer 1

If a variable contains a regex, you can use it without further ado inside another regex.

The second trick is to use an array variable inside a regex, which is equivalent to the disjunction of the array elements:

my @reg =
  /foo/,
  /bar/,
  /baz/,
  /pun/
  ;

my @transformed = @reg.kv.map(-> $i, $rx { rx/ $i $rx /});

my @match =  "0foo_1barz" ~~ m:g/ @transformed /;

.say for @match;