Look up Enum by label instead of by value - enums

Question

Is there a quick way to look up an Enum with only using the label of the enum instead of the value. Let's say the Enum type is SalesStatus, I want to be able to basically call into some kind of a function like enumLabel2Value(enumStr(SalesStatus), "Open order") and it will return 1.
I'm trying to avoid looping thru all possible values and checking each one separately, it seems like this should be something that's readily available since whenever a user filters on a enum column on a grid, they enter in the label, not the value, but I haven't seen anything like it.

Answer 1

You can use the str2Enum function for that. From the documentation:
Retrieves the enum element whose localized Label property value
matches the input string.
In addition to the caveats from Alex Kwitny's answer, I recommend taking a look at the comments of the documentation, specifically the comment
Please note that str2Enum performs partial matching and matches the
beginning of the string. If there are multiple matches, it will take
the first one.
In addition take a look at method string2Enum of class DMFEntityBase, which supports different options how the enum element can be specified. I think with the DictEnum.name2Value() method enum elements specified by their label are handled.
Update
OP mentioned in the comments to Alex Kwitny's answer that it is a specific enum ExchangeRateDisplayFactor he has issues with. str2Enum also works with that enum, as the following job demonstrates:
static void str2EnumTest(Args _args)
{
ExchangeRateDisplayFactor factor;
factor = str2Enum(factor, '1');
info(strFmt('%1', factor)); // outputs '1'
factor = str2Enum(factor, '10');
info(strFmt('%1', factor)); // outputs '10'
factor = str2Enum(factor, '100');
info(strFmt('%1', factor)); // outputs '100'
factor = str2Enum(factor, '1000');
info(strFmt('%1', factor)); // outputs '1000'
factor = str2Enum(factor, '10000');
info(strFmt('%1', factor)); // outputs '10000'
}

Answer 2

It doesn't exist because labels can be all sorts of things in different languages. symbol2Value() exists though and may be what you're looking for, but your question is specifically on labels. An example of where this could be very bad...
Let's say you have an enum called GoodBadPresent, to indicate what type of Christmas present you will receive, with two values:
GoodBadPresent::Poison English label: "Poison"; German label: "Gift"
GoodBadPresent::Gift English label: "Gift"; German label: "Geschenk"
If this example isn't clear, the word for Poison in German is Gift. So if you tried to resolve Gift to an enum value, you'd also have to provide the language. The performance problems here are probably greater than the performance problems of looping through an enum.
You can look at DictEnum to see if there are any methods that can help you more succinctly achieve what you want though. https://msdn.microsoft.com/en-us/library/gg837824.aspx
I'm more curious to the details of your scenario where you need to get back to an enum from a label.