The search capability supports the following operators:
A leading plus sign indicates that this word must be present in each row that is returned.
A leading minus sign indicates that this word must not be present in any of the rows that are returned.
By default (when neither + nor - is specified) the word is optional, but the rows that contain it are rated higher.
Parentheses group words into subexpressions. Parenthesized groups can be nested.
A leading tilde acts as a negation operator, causing the word's contribution to the row's relevance to be negative.
The asterisk serves as the truncation (or wildcard) operator. Unlike the other operators, it should be appended to the word to be affected. Words match if they begin with the word preceding the * operator.
A phrase that is enclosed within double quote (“"”) characters matches only rows that contain the phrase literally, as it was typed.
Source: MySQL Reference Manual :: Boolean Full-Text Searches
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