Syntax: replace (,,) PostgreSQL Version: 9.
For example, sentences that begin with "Cat" will be replaced with lower-case "dog" which break sentence capitalization.Ĭheck out the current PostgreSQL pattern matching docs for all the details. The PostgreSQL replace function is used to replace all occurrences of matchingstring in the string with the replacewithstring. SELECT regexp_replace('Cat bobcat cat cats catfish', '\mcat(s?)\M', 'dog\1', 'gi') Ä®ven after all of that, there is at least one unresolved condition. SELECT regexp_replace('Cat bobcat cat cats catfish', '\mcat\M', 'dog', 'gi') SELECT regexp_replace('Cat bobcat cat cats catfish', 'cat\M', 'dog', 'gi') SELECT regexp_replace('Cat bobcat cat cats catfish', '\mcat', 'dog', 'gi') SELECT regexp_replace('Cat bobcat cat cats catfish', 'cat', 'dog', 'gi') SELECT regexp_replace('Cat bobcat cat cats catfish', 'cat', 'dog', 'g') SELECT regexp_replace('Cat bobcat cat cats catfish', 'cat', 'dog', 'i') SELECT regexp_replace('Cat bobcat cat cats catfish', 'cat', 'dog') Let's see how easy it is to replace a cat with a dog. FROM tablename WHERE condition Everything is the same: specify the name of your existing view and enter the updated query after the AS keyword. There are usually quite a few gotchas when performing regex replacment. If you need to update the defining query of an already existing view, you can use the CREATE OR REPLACE statement: CREATE OR REPLACE viewname AS SELECT column1, column2. I will also use \m and \M to match the beginning and the end of a word, respectively. I will use flags i and g for case-insensitive and global matching, respectively. You can also wrap these statements in a transaction. In order to do so, you can use the DROP TRIGGER and CREATE TRIGGER statements. It has the syntax regexp_replace(source, pattern, replacement ). PostgreSQL doesnât support the OR REPLACE statement that allows you to modify the trigger definition like the function that will be executed when the trigger is fired. If you need stricter replacement matching, PostgreSQL's regexp_replace function can match using POSIX regular expression patterns.
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