3 good questions on "Filtering BGP Updates by Matching the AS_PATH PA"

What are the command to filter AS_PATH PA?
-ip as-path access-list number {permit | deny} regex
-neighbor neighbor-id filter-list as-path-filter-number {in|out}
What does the regex character .* mean and when is it used?
Useful as a final match to change the default from deny to permit
What does the regex character ^$ mean?
Null (empty)
Use for NLRIs originated in same AS
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