Event Text Substing?

My question refers to the event where you can check for players typing a message. Is it possible to make it so it reads the first part of the text then stores the number at the end to a variable to use in the actions?

Example: If i enter -Vision 1,-Vision 2, ETC. can i make the trigger read the -Vision then take the number and use it in the actions?

There is the option of substring in the event versus exact match what does this mean?

Updated: Ignore this, i need to learn to post only when i'm stuck. I found out what i needed.

Glad to see you've realized what it means to raise a completely pointless thread from the dead.