Custom input pattern in textbox : >I am looking for a code that will validate custom values into the textbox for a window form such that the input entered follows a certain pattern as shown-|"DB1.DBX1.0"|"DB1000.DBB1000.0"|"DB18.DBD4.0"|"DB99.DBW999.0"| such that 
DB[1-1000].DB[X,B,D,W][1-1000.0-10] and if the values match the required pattern the valued would be accepted or else it will show an error.

I have also attached textbox image for the reference.

The textbox looks like such: https://i.stack.imgur.com/mAmAs.png