Replace dash value but not -ve sign values within a field

Prajakta29

Hello. I have multiple fields in a dataset that have "-" as a value which I want to replace with a blank. However any replace function I try, it also replaces the -ve sign in the column. How can I avoid this? I only want to replace the entire dash value and retain the negative values. 

Attaching is a sample dataset. This is the regex function I tried but it replaces negative values as well:

REGEX_Replace([_CurrentField_], "\-", " ")

dummy data.xlsx

tim-regas

Using sheet 2 from the dummy data, you an use a select tool to convert the strings to double type. This will drop the - values and replace them with null while retaining the negative values.