May 2020
Beginner
564 pages
14h 9m
English
Content preview from Learn SQL Database Programming
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Using regular expressions
Regular expressions (REGEXP) help you search for string patterns in your data. REGEXP expands upon the patterns you can use in the LIKE operator, which we covered in Chapter 6, Querying a Single Table. LIKE allowed you to use the percent sign (%) wildcard to represent zero or more characters or the underscore (_) wildcard to represent one or more characters to match patterns on strings in the WHERE clause. Regular expressions have far more wildcard characters, thereby giving you far more options for matching patterns. The downside to regular expressions is that they can be complicated and hard to understand. Regular expressions can also reduce query performance, depending on how complex they get.
The following table ...
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