strip

assert("beta".strip(' ') == "beta");
assert(" beta ".strip(' ') == "beta");
assert("  beta  ".strip(' ') == "beta");
assert("   beta   ".strip(' ') == "beta");
assert(" _ beta _ ".strip(' ') == "_ beta _");
assert(" _  beta _ ".strip(' ') == "_  beta _");
version (unittest) {
	static char[] f()() @safe pure nothrow { char[1] x = "_"; return x[].strip(' '); }
	static if (hasPreviewDIP1000) static assert(!__traits(compiles, { auto _ = f(); }));
}

const ubyte[3] x = [0, 42, 0];
assert(x.strip(0) == x[1 .. 2]);