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Postings from October 2015
On Mon, Oct 19, 2015 at 09:16:43AM -0600, Karl Williamson wrote:
> 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.
Excellent.
Abigail
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