December 2010
Intermediate to advanced
451 pages
11h 16m
English
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7-13. Finding a Pattern Within a String
Problem
You want to find the number of occurrences of a particular pattern within a given string. For instance, you want to search for email addresses within a body of text.
Solution
Use a regular expression to match a given string against the body of text and return the resulting count of matching occurrences. The following example searches through a given body of text and counts the number of email addresses it encounters. Any email address will be added to the tally because a regular expression is used to compare the strings.
CREATE OR REPLACE PROCEDURE COUNT_EMAIL_IN_TEXT(text_var IN VARCHAR2) AS
counter NUMBER := 0;
mail_pattern VARCHAR2(15) := '\w+@\w+(\.\w+)+';
BEGIN counter := REGEXP_COUNT(text_var, ...Become 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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