Regular expression action

eg.

^d+(?= -)

Emha,

Thankyou so much that worked really well. Here i am storing the output in an Collection variable      (eg: 22;55;12), but i need this output for the switch action to run (I cant use a collection variable in switch)

- So i have used a "convert value action" and storing the above collection variable output to a number variable, but i am getting error because its is storing the number with ";" (eg: 22;) 

what would you expect from converting a collection to numeric variable???

converting set of/array of multipliple values into single scalar value??? - which one should it take???

you have to run a for ech loop over collection, pick single element from the collection and work with that single element further on (eg. use it in switch)

I want to convert file extension of Excel document from .xls to.xlsx which is found in a document library. Any suggestion on this?