NOT Regexp Operator in MySQL Regular Expressions

The NOT Regexp operator is a way of matching data that does not match a specified regular expression pattern in MySQL. In this tutorial, we will cover the syntax, example, output, explanation, use, important points, and summary of the NOT Regexp operator in MySQL.

Syntax

The syntax for using the NOT Regexp operator is as follows:

SELECT column_name
FROM table_name
WHERE column_name NOT REGEXP 'pattern';

In this syntax, column_name refers to the column you want to search for matching data, table_name refers to the table name in which the data resides, and pattern refers to the regular expression pattern you want to match the data against.

Example

Let's say we have a table called users, which contains a column called name. We want to select all the rows that do not contain the word "John" in the name column. Here's how we can use the NOT Regexp operator:

SELECT *
FROM users
WHERE name NOT REGEXP 'John';

Output

The output of the above MySQL query will select all the rows from the users table that do not contain the word "John" in the name column.

Explanation

In the example above, we used the NOT Regexp operator to select all the rows from the users table that do not contain the word "John" in the name column. The NOT operator negates the result of the REGEXP operator, meaning it selects all the rows that do not match the regular expression.

Use

The NOT Regexp operator is useful when you want to select all the rows that do not match a particular pattern in a column. It can be used to search for data that does not fit a particular criteria.

Important Points

• The NOT Regexp operator negates the result of the REGEXP operator.
• The operator can be used in the WHERE clause of a MySQL SELECT statement.
• The regular expression pattern can be any valid regular expression.

Summary

The NOT Regexp operator in MySQL Regular Expressions is a useful tool when you want to select all the rows that do not match a particular pattern. It can be used in the WHERE clause of a MySQL SELECT statement to search for data that does not fit a particular criteria. Understanding how to use the NOT Regexp operator in MySQL can help you write more efficient and effective database queries.