SQL Server 2012 :: Query To Find Distinct Multiple Instances Of A Pattern In A String?

One of my varchar columns in a table has multiple key words enclosed in a pattern of special characters.

Eg: William Shakespeare was an English [##poet##], [##playwright##], and [##actor##], widely regarded as the greatest [##writer##] in the English language and the world's pre-eminent [##dramatist##]. He is often called England's national [##poet##] and the "Bard of Avon". His extant works, including some collaborations, consist of about 38 plays, 154 [##sonnets##], two long narrative [##poems##], and a few other [##verses##], of which the authorship of some is uncertain. His plays have been translated into every major living language and are performed more often than those of any other [##playwright##].

I need to write to query to find all distinct key words that are enclosed within [## and ##]. My query should yield the following results from the string in the example above

[##actor##]
[##dramatist##]
[##playwright##] -- 2 occurrances, but I need it only once in my result set
[##poems##]
[##poet##] -- 2 occurrances, but I need it only once in my result set
[##sonnets##]
[##verses##]
[##writer##]

I need to run this on a large table, so I am looking for the best possible way to minimize any performance issues.

Just give you sample code, I have provided below 2 separate snippets, one with table variable and another with temp table.

DECLARE @MyTable TABLE (MyString VARCHAR (8000))
INSERT @MyTable VALUES ('William Shakespeare was an English [##poet##], [##playwright##], and [##actor##], widely regarded as the greatest [##writer##] in the English language and the world''s pre-eminent [##dramatist##]. He is often called England''s national [##poet##] and the "Bard of Avon". His extant works, including some collaborations, consist of about 38 plays, 154 [##sonnets##], two long narrative [##poems##], and a few other [##verses##], of which the authorship of some is uncertain.

[code].....