![]() ![]() an original string, a substring that you want to replace, and a new substring that will replace the old substring. The REPLACE () function takes three parameters i.e. 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. In PostgreSQL, the REPLACE () function finds a string/substring and replaces it with a new string/substring. ![]() SELECT regexp_replace('Cat bobcat cat cats catfish', '\mcat(s?)\M', 'dog\1', 'gi') Įven 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') I will use flags i and g for case-insensitive and global matching, respectively. It has the syntax regexpreplace (source, pattern, replacement, flags ). SELECT regexp_replace('Cat bobcat cat cats catfish', 'cat', 'dog', 'gi') If you need stricter replacement matching, PostgreSQL's regexpreplace function can match using POSIX regular expression patterns. You can find details here, here and here. Please note it's heavily dependent on standardconformingstrings setting. ![]() SELECT regexp_replace('Cat bobcat cat cats catfish', 'cat', 'dog', 'g') 2 Answers Sorted by: 2 You can use string escape syntax and replace (string,substring,replacement) function like below. 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. There are usually quite a few gotchas when performing regex replacment. I will also use \m and \M to match the beginning and the end of a word, respectively. It has the syntax regexp_replace(source, pattern, replacement ). If you need stricter replacement matching, PostgreSQL's regexp_replace function can match using POSIX regular expression patterns. ![]()
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