DB2 Regular Expressions: Complete Usage Guide

In DB2 database, regular expressions can be used for pattern matching and querying. Here are some common applications of using regular expressions.

1. Use regular expressions for conditional filtering in the WHERE clause, for example:

SELECT column1, column2
FROM table
WHERE column1 REGEXP '^A.*'

1. Perform replacement operations using regular expressions, such as:

UPDATE table
SET column1 = REGEXP_REPLACE(column1, '[0-9]', '')

1. Perform data validation using regular expressions, for example:

SELECT column1
FROM table
WHERE column1 NOT REGEXP '^[0-9]+$'

It should be noted that the regular expression syntax of the DB2 database may differ from other databases, and it is necessary to refer to the corresponding documentation to understand the specific syntax rules and supported functions.