parseNumeric

 //Numeric.RPL_SASLMECHS
	import std.algorithm.searching : canFind;
	import std.range : only, takeNone;
	{
		auto logon = parseNumeric!(Numeric.RPL_SASLMECHS)(only("test", "EXTERNAL,PLAIN", "Well hello there"));
		assert(logon.get.canFind("EXTERNAL"));
		assert(logon.get.canFind("PLAIN"));
	}
	{
		immutable logon = parseNumeric!(Numeric.RPL_SASLMECHS)(takeNone(only("")));
		assert(logon.isNull);
	}
	{
		immutable logon = parseNumeric!(Numeric.RPL_SASLMECHS)(only("test"));
		assert(logon.isNull);
	}