August 2013
Intermediate to advanced
1472 pages
38h
English
Content preview from Oracle Database 12c The Complete ReferenceBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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CHAPTER8Searching for Regular Expressions
The SUBSTR, INSTR, LIKE, REPLACE, and COUNT functions have been enhanced and extended to support searches for Unix-like regular expressions. Regular expressions support a wide array of standardized controls and checks—for example, matching values a specific number of times, searches for punctuation characters, or searches for digits. You can use these new functions to perform advanced searches against strings. These functions, introduced in Oracle Database 10g, are named REGEXP_SUBSTR, REGEXP_INSTR, REGEXP_LIKE, REGEXP_REPLACE, and REGEXP_COUNT.
NOTE
Users who have previously used the Unix grep command ...
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