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Oracle Regular Expressions
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Tutorial and Quick Reference. Jonathan Gennick & Peter Linsley. Pocket Reference. Oracle . Oracle Regular Expressions Pocket Reference. Tutorial .
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Tutorial A regular expression (often known as a regex) is a sequence ofcharacters that describe a pattern in text. Regular expres-sions use a syntax 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 allowyou to work with text in terms of patterns. For example, youcan use regular expressions to search the park table and iden- tify any park with a description containing text that looks likea phone number. You can then use the same regular expres-sion to extract that phone number from the description.
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