How Can I Extract and Filter Consecutive Digits Greater Than 20 from a MySQL Text Field?

Extracting Two Consecutive Digits in MySQL

The provided SQL query successfully identifies text fields containing two consecutive digits. However, to extract these numbers as a separate field, consider incorporating additional functionality into the query.

Option 1: Utilizing LIB_MYSQLUDF_PREG

This open-source library offers enhanced regular expression capabilities for MySQL. It provides functions like PREG_CAPTURE, enabling the extraction of matches from a string. Install and configure this library to access these functions.

Option 2: User-Defined Function for Regex Extraction

Create a custom function like REGEXP_EXTRACT to extract the longest matching substring based on a provided regular expression. This function can be fine-tuned to handle specific requirements, such as the inclusion of '^' and '$' delimiters.

The REGEXP_EXTRACT function can be modified to suit specific needs:

CREATE FUNCTION REGEXP_EXTRACT(string TEXT, exp TEXT)
RETURNS TEXT
DETERMINISTIC
BEGIN
  ... (function code goes here)
END

Additional Criteria: Numbers Greater Than 20

Once you have extracted the numbers as a field, you can apply additional filtering in your query:

SELECT `id`, `number_extracted`
FROM (
  SELECT `id`, `originaltext`
  FROM `source`
  WHERE `originaltext` REGEXP '[0-9][0-9]'
) AS subquery
WHERE `number_extracted` > 20

This extended query will return rows where the extracted numbers exceed 20. By combining these techniques, you can refine your MySQL query to extract and manipulate consecutive digits as needed.

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