By Jonathan Gennick
Aid for normal expressions in SQL and PL/SQL is likely one of the most enjoyable positive aspects of Oracle Database 10G. Oracle has lengthy supported the ANSI-standard LIKE predicate for rudimentary trend matching, yet general expressions take development matching to a brand new point. they supply a strong solution to decide on facts that fits a trend, in addition to to govern, rearrange, and alter that facts. This concise pocket advisor is a component educational and half quick-reference. it is compatible when you have by no means used normal expressions earlier than, in addition to those that have adventure with Perl and different languages assisting ordinary expressions. The booklet describes Oracle Database 10G's help for normal expressions, together with globalization aid and modifications among Perl's syntax and the POSIX syntax supported via Oracle 10G. It additionally presents a entire reference, together with examples, to all supported ordinary expression operators, capabilities, and blunder messages. O'Reilly's Pocket References became a favourite between builders and database directors all over the place. via supplying a wealth of vital info in a concise, well-organized layout, those convenient books bring simply what you must whole the duty to hand. even if you are utilizing standard expressions for the 1st time or utilising your talents from different languages to the most recent model of Oracle, the Oracle typical Expressions Pocket Reference is the ebook to have nearby.
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Additional info for Oracle regular expressions: pocket reference
Sample text
To allow a quantifier to be applied to the subexpression as a whole. The regular expression in the following example uses parentheses twice. The innermost set constrains the alternation to the three fruit names. The outermost set defines a subexpression in the form of fruit name + space, which we require to appear from 1 to 3 times in the text. 8, for more examples showing the use of parentheses in regular expressions. 9 Oracle Regular Expression Functions Oracle's regular expression support, which we introduced earlier in the book, manifests itself in the form of four functions, which are described in this section.
Carefully check each subexpression to be sure you include both opening and closing parentheses. Check to see whether you've correctly escaped parentheses that do not enclose subexpressions, and make sure you haven't inadvertently escaped a parentheses that should open or close a subexpression. ORA-12726: unmatched bracket in regular expression You have mismatched square brackets in your expression. Apply the advice we give for ORA-12725, but this time look at your use of square brackets. Also, while an expression such as '[a' will cause this error, an expression such as 'a]' will not, because a closing (right) bracket is treated as a regular character unless it is preceded by an opening (left) bracket.
While the pattern shown in this section is an interesting way to rid yourself of doubled words, it may or may not yield correct sentences. 6 for a more comprehensive explanation of backreferences. REGEXP_SUBSTR Extracts text matching a pattern 39 40 REGEXP_SUBSTR scans a string for text matching a regular expression, and then returns that text as its result. If no text is found, NULL is returned. Syntax REGEXP_SUBSTR(source_string, pattern [, position [, occurrence [, match_parameter]]] All parameters but the first two are optional.