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Postings from October 2015
On 10/19/2015 09:07 AM, Abigail wrote:
> On Mon, Oct 19, 2015 at 08:33:51AM -0600, Karl Williamson wrote:
>> On 10/19/2015 08:26 AM, Abigail wrote:
>>> $ perl -wE '"aaaaaaaaaa" =~ /a { 1,10}/x; say $& // "UNDEF"'
>>> UNDEF
>>> $
>>>
>>> (In this case, it tries to match the literal string "a{1,10}" -- one
>>> can wonder whether that's the most useful thing it could do).
>>
>> Note that this now give a warning, even without the '-w' command line
>> option:
>>
>> $ blead -E '"aaaaaaaaaa" =~ /a { 1,10}/x; say $& // "UNDEF"'
>> Unescaped left brace in regex is deprecated, passed through in regex;
>> marked by <-- HERE in m/a { <-- HERE 1,10}/ at -e line 1.
>> UNDEF
>> $
>
>
>
> Yes, I know.
>
> Is that useful? I'd wager that of all the people who write
>
> /a { 1,10}/x
>
> more than 99.9% of want it to behave like
>
> /a {1,10}/x
>
> and none of them actually want to match the literal string
>
> "a{1,10}"
>
>
> Abigail (who has put a space after the , in /x{n,m}/ way too often).
>
I think the warning is useful, so they aren't silently deceived. It was
never useful to behave as it has, but now they are warned.
In 5.24, this will not compile. In 5.26, it will behave as you and I
both think would be the useful way.
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