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Oracle Regular Expressions

Source: www.oracle.com
Topic: Oracle Programming


Short Desciption:
4 | Oracle Regular Expressions Pocket Reference Tutorial A regular expression (often known asa regex ... growing range of editors, emailcli- ents, programming languages, scripting languages, and now Oracle SQL ...

 

Content Inside:
Tutorial and Quick Reference Jonathan Gennick & Peter Linsley Pocket Reference Oracle Regular Expressions Oracle Regular Expressions Pocket Reference Jonathan Gennick and Peter Linsley Beijing • Cambridge • Farnham • Köln • Paris • Sebastopol • Taipei • Tokyo 4 | Oracle Regular Expressions Pocket Reference Tutorial A regular expression (often known asa regex ) is a sequence of characters that describe a pattern in text. Regular expres- sionsuseasyntax that has evolved over a number of years, and that is now codified as part of the POSIX standard. Regular expressions are extremely useful, because they allow you to work with text in terms of patterns. For example, you can use regular expressions to search the park table and iden- tifyanyparkwitha description containing text that looks like a phone number. You can then use the same regular expression     to extract that phone number from the description. NOTE This tutorial will get you started using regular expressions,       but we can only begin to cover the topic in this small book. If you want to learn about regular expres- sionsindepth, see Jeffrey Friedlsexcellentbook Mastering    Regular Expressions (OReilly). Patterns The simplest type of pattern is simply an exact string of char- actersthatyouare searching for, such as the string in the following       WHERE clause: SELECT * FROM park WHERE park_name=Mackinac Island State Park; However, the string Mackinac Island State Park isntwhat most people think of when you mention the word"pattern." The expectation is that a pattern will use so-called metachar- acters that allow for matches when you know only the general     pattern of text you are looking for. Standard SQLhas long had rather limited support for pattern matching in the form of the LIKE predicate. For exa ...

 

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