DO pRequest.SetValueAt($REPLACE(pRequest.GetValueAt("NTE:3"),$C(13,10),$C(32)),"NTE:3")

I’m not sure I understand your request correctly.
But 'FindInFilesRegex' exists.

Maybe a "stupid" answer

But 

You need perhaps to specify "/directorya/directoryb" without the slash.

I have checked where I am working with have around 10 ftp connections and all specifications without the slash.

SELECT TOP ALL FirstName||' '||LastName AS DisplayName, UserType, IsActive, RoleName, DOB FROM LISDB.ExternalUsers
Where FirstName||' '||LastName Like '%Praja%'

Where is the "tval" variable defined?