Determining if "in a text set"

Hi,

I have a table/class with a text field which contains a single word
(possibly trailed by whitespaces). Given a phrase (a text literal composed
of words separated by one or more whitespaces), what's the best way to
SELECT those tuples with fields containing instances that match exactly
one of the words in the given string?

Example:

Table:
Tuple# ... FieldN
1 ... 'MON'
2 ... 'TUE'
3 ... 'THURS'
4 ... 'THU'
5 ... 'FRI'

Given phrase:
'MON TUE WED THURS'
Tuple 1 will match
Tuple 2 will match
Tuple 3 will match
Tuple 4 will NOT match
Tuple 5 will NOT match

Right now, I'm extracting (using strtok(), 8^P) each word from the given
phrase and using "SELECT * FROM {class} where FieldN LIKE '%{word}%'", but
it's terribly slow, relies on strtok() to parse words, and Tuple 4 above
will match.

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