not

Negates predicate pred.

template not(alias pred)

not

(

T...

)

(

auto ref T args

)

Parameters

A function which calls pred and returns the logical negation of its return value.

import std.algorithm.searching : find;
import std.uni : isWhite;
string a = "   Hello, world!";
assert(find!(not!isWhite)(a) == "Hello, world!");