Can I check if a value is convertible to a valid value of an enum?

[French Football via Digitalmars-d-learn]

...without having to loop over the enum?

enum SomeType : string { CHEESE = "cheese", POTATO = "potato" }
string valid_value = "cheese";
string invalid_value = "pizza";
bool test( string value ){
    if( value.isConvertableToSomeType ){ // this be the magic I 
seek
        //do something
        return true;
    }
    return false;
}

void main(){
    writeln( test( valid_value ) ); //prints true
    writeln( test( invalid_value ) ); //prints false
}

Or would I need to foreach over the enum somehow?