Rules:

1 - Only words with 2 or more characters are accepted
2 - Max 200 chars total
3 - Space is used to split words, "" can be used to search for a whole string (not indexed search then)
4 - AND, OR and NOT are prefix words, overruling the default operator
5 - +/|/- equals AND, OR and NOT as operators.
6 - All search words are converted to lowercase.