I've never used it myself, but it might have some value here - I don't know what database your using, but MySQL has a Full Text Search capability, and I think Oracle has something similar - not sure about PostgreSQL.

Here's a snippet from a doc I found on www.mysql.com when I did a search(upper right) for 'full text search':

As of Version 3.23.23, MySQL has support for full-text indexing and se
+arching. Full-text indexes in MySQL are an index of type FULLTEXT. FU
+LLTEXT indexes are used with MyISAM tables only and can be created fr
+om CHAR, VARCHAR, or TEXT columns at CREATE TABLE time or added later
+ with ALTER TABLE or CREATE INDEX. For large datasets, it will be muc
+h faster to load your data into a table that has no FULLTEXT index, t
+hen create the index with ALTER TABLE (or CREATE INDEX). Loading data
+ into a table that already has a FULLTEXT index will be slower.

Full-text searching is performed with the MATCH() function. 

mysql> CREATE TABLE articles (
    ->   id INT UNSIGNED AUTO_INCREMENT NOT NULL PRIMARY KEY,
    ->   title VARCHAR(200),
    ->   body TEXT,
    ->   FULLTEXT (title,body)
    -> );
Query OK, 0 rows affected (0.00 sec)

mysql> INSERT INTO articles VALUES
    -> (NULL,'MySQL Tutorial', 'DBMS stands for DataBase ...'),
    -> (NULL,'How To Use MySQL Efficiently', 'After you went through a
+ ...'),
    -> (NULL,'Optimising MySQL','In this tutorial we will show ...'),
    -> (NULL,'1001 MySQL Tricks','1. Never run mysqld as root. 2. ...'
+),
    -> (NULL,'MySQL vs. YourSQL', 'In the following database compariso
+n ...'),
    -> (NULL,'MySQL Security', 'When configured properly, MySQL ...');
Query OK, 6 rows affected (0.00 sec)
Records: 6  Duplicates: 0  Warnings: 0

mysql> SELECT * FROM articles
    ->          WHERE MATCH (title,body) AGAINST ('database');
+----+-------------------+------------------------------------------+
| id | title             | body                                     |
+----+-------------------+------------------------------------------+
|  5 | MySQL vs. YourSQL | In the following database comparison ... |
|  1 | MySQL Tutorial    | DBMS stands for DataBase ...             |
+----+-------------------+------------------------------------------+
2 rows in set (0.00 sec)
[download]

and it continues on...

Here's the link to this page:

http://www.mysql.com/doc/en/Fulltext_Search.html

HTH.