implement :dba adverbs in regexes

[p6rt]

Migrated from rt.perl.org#76744 (status was 'open')

Searchable as RT76744$

[p6rt]

From @moritz

alpha supported :dba('rule name'), current Rakudo doesn't, but should.

[p6rt]

@coke - Status changed from 'new' to 'open'

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From @FROGGS

<moritz> r​: '(abc' ~~ /'(' ~ ')' .*/
<p6eval> rakudo 11157e​: OUTPUT«Unable to parse expression in ; couldn't
find final ')'␤ in any FAILGOAL at src/stage2/QRegex.nqp​:1084␤ in
regex at /tmp/xlSE26SbHW​:1␤ in method ACCEPTS at
src/gen/CORE.setting​:10799␤ in block at /tmp/xlSE26SbHW​:1␤␤»

<moritz> r​: '(abc' ~~ /​:dba('foo') '(' ~ ')' .*/
<p6eval> rakudo 11157e​: ( no output )

<moritz> the presence of :dba causes the failure to be silent
<moritz> that's bad

[p6rt]

From @AlexDaniel

Related doc ticket (with some discussion)​: Raku/doc#1695

On 2010-07-27 02​:32​:49, moritz wrote​:

alpha supported :dba('rule name'), current Rakudo doesn't, but should.