From @masak

<masak> rakudo​: +("freeeeeeeeeeeeeeeew" ~~ /('e'|'w')*/)[0]
<p6eval> rakudo 9a84c3​: OUTPUT«Use of uninitialized value␤»
<masak> <TimToady> that oughta work...
<masak> did someone report this?
<masak> rakudo​: +("eeeeeeeeeeeeeeeew" ~~ /('e'|'w')*/)[0]
<p6eval> rakudo 9a84c3​: RESULT«17»
* masak submits rakudobug

The first piece of code should evaluate to 17 as well, IMO. The regex
was later simplified to /(e)*/ with the same outcome.

From @moritz

On Wed Mar 25 02​:57​:13 2009, masak wrote​:

<masak> rakudo​: +("freeeeeeeeeeeeeeeew" ~~ /('e'|'w')*/)[0]
<p6eval> rakudo 9a84c3​: OUTPUT«Use of uninitialized value␤»
<masak> <TimToady> that oughta work...
<masak> did someone report this?
<masak> rakudo​: +("eeeeeeeeeeeeeeeew" ~~ /('e'|'w')*/)[0]
<p6eval> rakudo 9a84c3​: RESULT«17»
* masak submits rakudobug

The first piece of code should evaluate to 17 as well, IMO. The regex
was later simplified to /(e)*/ with the same outcome.

It does work as designed. It matches the zero repetition (and thus empty
string)

15​:53 < moritz_> rakudo​: ?("freeeeeeeeeeeeeeeew" ~~ /('e'|'w')*/)
15​:53 < p6eval> rakudo 9a84c3​: RESULT«Bool​::True»

And since it matched the parenthesis group zero times, $/[0] is the
empty list.

If you want to match at least once, use +.

Cheers,
Moritz

The RT System itself - Status changed from 'new' to 'open'

@moritz - Status changed from 'open' to 'rejected'