[Power Scripts/JJUPIN] Check if field/variable contains a valid issue key

[Błażej O_]

I want to validate if user have passed the proper issue key in custom field during transition. Is there any elegant way to check if the field contains a valid issue key?

So far I use the following trick, but it is a little "hacky":

if (countIssues("key ="+customfield_00000) > 0)
{
    //execcute code, because issue exists
}
else
{
    //throw message telling user to provide a proper issue key
}

 Any better/shorter ideas how to achieve this?

[Jonathan Muse _Appfire_]

I think the solution you came up with is pretty good. I can't think of a better way.