"huckabee AND jfkadlsfj fdsfldfj06329 OR reagan AND biden AND clinton OR sebelius OR mccain"
I'm trying to take a string such as the one shown above, and to surround with parentheses all word groups that are connected by " OR ".
A word group is defined as all the characters between " AND " or " OR ".
For instance, in the string shown above, "jfkadlsfj fdsfldfj06329 OR reagan" and "clinton OR sebelius OR mccain" would both be esconced with an opening and a closing parentheses.
The code I have tried below has simply put the entire string in parentheses. Any ideas? Thanks in advance. 
$string = "huckabee AND jfkadlsfj  fdsfldfj06329 OR reagan AND biden A
+ND clinton OR sebelius OR mccain";
$string =~ s/(^|.+ OR |.+ AND )(.* OR .*)*($| OR .+| AND .+)/$1($2)$3/
+g;

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In reply to Building a boolean search engine by Anonymous Monk

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