MySQL Not regexp Operator

The MySQL NOT REGEXP operator is used in SQL queries to filter rows that do not match a regular expression pattern in a column. It is the opposite of the REGEXP operator, which is used to filter rows that match a regular expression pattern. The NOT REGEXP operator is typically used with the WHERE clause in a SELECT statement.

The basic syntax of the NOT REGEXP operator is as follows:

SELECT column1, column2, ...
FROM table
WHERE column_name NOT REGEXP pattern;

• column1, column2, ...: The columns you want to retrieve in the query.
• table: The name of the table you are querying.
• column_name: The name of the column you want to filter based on.
• pattern: The regular expression pattern to match against the column’s values.

Here’s an example:

Suppose you have a table named emails with a column named email_address, and you want to find all email addresses that do not match a specific pattern (e.g., you want to exclude all email addresses that do not end with “.com”):

SELECT email_address
FROM emails
WHERE email_address NOT REGEXP '\\.com$';

In this query, the NOT REGEXP operator is used to filter out rows where the email_address column does not match the regular expression pattern '\\.com$'. The regular expression \\.com$ matches email addresses that end with “.com.”

Regular expressions provide powerful and flexible pattern matching capabilities, allowing you to filter rows based on complex patterns. You can adjust the regular expression pattern to meet your specific requirements.

Please note that regular expressions can vary in complexity, and writing complex regular expressions may require a good understanding of regular expression syntax.