On Thursday, 22 March 2018 at 04:49:39 UTC, Seb wrote:
No need for regular expressions. D is powerful enough without
them:
```
alias lowercased = (m, n) =>
m.take(n).asLowerCase.chain(m.drop(n));
```
https://run.dlang.io/is/cSL0si
And with the filter, so it passes the assert:
```
string input = "My Capital String";
auto lower1 =
input.take(1).asLowerCase.chain(input.drop(1).filter!(c => c != '
')).array;
assert(lower1 == "myCapitalString");
```
Also a few more options (including a slice version):
https://run.dlang.io/is/dZHcSo
As the input is never read until the array() is run, each element
in the array should only be copied from RAM to the stack once.
And if you compile with LDC a lot of it can be inlined and the
stack copies of the range structs and elements should be
minimised even further.
