Special symbols used in search engines

Double quotes ("")

To query the keyword plus double quotes (half-width, the following additional symbols with this), you can achieve accurate query, this method requires the query results to exact match, does not include the evolution of the form.

Use the plus sign (+)

Using the plus sign in front of the keyword also tells the search engine that the word must appear on the page in the search results.

Use minus sign (-)

Using the minus sign in front of the keyword means that the keyword cannot appear in the query results.

Wildcard characters (* and?)

Wildcard characters include an asterisk (*) and a question mark (?), which means that the number of matches is unrestricted and the number of characters that match is limited, mainly used in English search engines.

Using Boolean retrieval

The so-called Boolean retrieval, refers to the standard Boolean logic relationship to express the logical relationship between keywords and keywords a query method, this query allows us to enter a number of keywords, the relationship between the key words can be expressed in a logical relationship.

And, called logical "and", connects with and, indicating that the two words it connects must also appear in the query results, for example, by entering "computer and book", which requires that both computer and book be included in the query results.

Or, called the logical "or", which indicates that either of the two keywords that are connected can appear in the query results, for example, entering "computer or book", which requires that the query result be computer only, or book, or both computer and book.

Not, called logical "non", indicates that the two keywords that are connected should exclude the second keyword from the first keyword concept, such as entering "automobile not car", which requires that the query result contain the automobile (automobile) but not the car.

Near, which indicates that the word distance between two keywords cannot exceed n words.

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