Okay, I'll try to help. Please consider being more specific next time. First of all here's your text again, in monospace this time:

--------------------
Approver Information
--------------------
Approver          Interfac Linked   Heir  Notifier User
List Typ Entity   Approver Approver Order Type     List
-------- -------- -------- -------- ----- -------- --------------------------------------------

The bold part is what you want, right? Are there always 20 dashes in the line before and 20 dashes in the line after? Or depends the number of dashes on the length of the string? If so, is there a minimum length to those strings? Can the text to be found consist of more than one line? Are their more lines starting with dashes in your file?

Here are some patterns that might work (using multiline pattern modifier): 

Always 20 dashes:

(?m)^-{20}\s+^(.*?)\s+^-{20}

Number of dashes in line before equals number of dashes in line after:

(?m)^(-+)\s+^(.*?)\s+^\1

Edit:

Ah, you gave more specifics while I replied. So the length of the dashes depends on the string you are looking for. My second pattern should work for you.

I can't discern if there's a space character in front of the dashes. If there is, then you might try this:

(?m)^(\s-+)\s+^\s(.*?)\s+^\1