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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. To search and replace all occurrences of a string with a new one, you use the REPLACE() function. 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') The PostgreSQL replace function replaces all occurrences of a specified string. 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') Each returned row is a text array containing the whole matched substring or the substrings matching parenthesized subexpressions of the pattern, just as described above for. REPLACE(stringexpression varchar, pattern varchar, replacement. SELECT regexp_replace('Cat bobcat cat cats catfish', 'cat', 'dog', 'g') This function returns no rows if there is no match, one row if there is a match and the g flag is not given, or N rows if there are N matches and the g flag is given. Removes all occurrences of a specified substring and replaces them with another string. 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. replace - Delete rows from postgres database contain string/sentence - Unix & Linux Stack Exchange Delete rows from postgres database contain string/sentence closed Ask Question Asked 7 years ago Modified 7 years ago Viewed 7k times 1 Closed.

,,) PostgreSQL Version: 9.

I will also use \m and \M to match the beginning and the end of a word, respectively. The PostgreSQL replace function is used to replace all occurrences of matchingstring in the string with the replacewithstring. I will use flags i and g for case-insensitive and global matching, respectively. create or replace function replacelookup (pinput text, preplacements lookup ) returns text as declare lrec lookup lresult text : pinput begin foreach lrec in array preplacements loop lresult : replace (lresult, lrec.source, lrec. 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.