Regex - Match line but with exception (! hyphen) - regex

Question

I'm trying to filter the event log based on regex but I'm unable to figure it out yet.
Scenario 1): I want to match the full line starting with Account Name but I don't want to match the line if it has - (hyphen) only that. But it should match -test-user.
I tried (Account Name:.*(!-).*) but it isn't working.
Content:
Account Name: -
Account Name: testing
Scenario 2): I want to try matching the second Account name line with or without hyphen in the Account For Which Logon Failed section and not from Subject section.
I tried (Account Name:.*){2} but it isn't working.
Content:
Account Name: -
Account Name: testing
Scenario 3): Combine both Scenario, Match the second Account name line but only it has no - (hyphen). If the second Account name has only hyphen then don't match anything but it should match -test-user.
I'm trying to learn here that's why I want to figure out all three scenario. Eventually I'll use only the last one.
Here is the full content:
Subject:
Security ID: NULL SID
Account Name: -
Account Domain: -
Logon ID: 0x0
Logon Type: 3
Account For Which Logon Failed:
Security ID: NULL SID
Account Name: testing

Answer 1

See if this answers your question
/Account Name:\s*[^-][a-z]+$/gm
You can find the working example here
if you want to match all the special characters excluding - then you can use
/Account Name:\s*[a-zA-Z0-9~##$^&*()_+=[\]{}|\\,.?:<>'"\/;`%]+.*$/gm
You can include any special character in the list that you want inside []
updated example