Multiline string literal improvements

[Igor]

On Wednesday, 11 October 2017 at 14:28:32 UTC, Meta wrote:
> On Wednesday, 11 October 2017 at 09:56:52 UTC, Igor wrote:
>> On Wednesday, 11 October 2017 at 08:35:51 UTC, Walter Bright 
>> wrote:
>>> On 10/10/2017 3:16 PM, sarn wrote:
>>>> Works even better in D because it can run at compile time.
>>>
>>> Yes, I see no need for a language feature what can be easily 
>>> and far more flexibly done with a regular function - 
>>> especially since what |q{ and -q{ do gives no clue from the 
>>> syntax.
>>
>> You are right. My mind is just still not used to the power of 
>> D templates so I didn't think of this. On the other hand that 
>> is why D is still making me say "WOW!" on a regular basis :).
>>
>> Just to confirm I understand, for example the following would 
>> give me compile time stripping of white space:
>>
>> template stripws(string l) {
>>     enum stripws = l.replaceAll(regex("\s+", "g"), " ");
>> }
>>
>> string variable = stripws(q{
>>    whatever and    ever;
>> });
>>
>> And I would get variable to be equal to " whatever and ever; 
>> ". Right?
>
> Even better, you could write the same code that you would for 
> doing this at runtime and it'll Just Work:
>
> string variable = q{
>     whatever and  ever;
> }.replaceAll(regex(`\s+`, "g"), " ");

I tried this but Disassembly view shows:

call std.regex.regex!string.regex
and
call std.regex.replaceAll!(string, char, 
std.regex.internal.ir.Regex!char).replaceAll

which means that replaceAll with regex is done at runtime, not 
compile time. Also when I just added enum in front of string 
variable then I got this:

Error: malloc cannot be interpreted at compile time, because it 
has no available source code