[Operation and Maintenance|Database] Using regular expressions for pattern matching in PostgreSQL

Here's how to use regular expressions for pattern matching in PostgreSQL:

SELECT column_name
FROM your_table
WHERE column_name ~ 'your_pattern';

In the query above:

column_name is the column name you want to search for.
your_table is the name of the table containing the data.
'your_pattern' is your regular expression pattern.
For example, if you want to find rows containing "example" in text_column, you can use the following query:

SELECT text_column
FROM your_table
WHERE text_column ~ 'example';

PostgreSQL supports rich regular expression functions, and you can use regular expressions to perform more complex pattern matching, including character classes, groupings, quantifiers, etc.

If you need to perform case-insensitive regular matching, you can use the ~* operator, as shown below:

SELECT column_name
FROM your_table
WHERE column_name ~* 'your_pattern';

This will perform case-insensitive regex matching. Likewise, PostgreSQL also supports other regular expression operators, such as ! _{(no match), !} * (case-insensitive mismatch), etc.