5/10/2023 0 Comments Postgresql regexTo get the entire matching data, the regex should have a question mark and a colon ( ?:) added at the beginning of the regex pattern to create a non-capturing group. In Postgres regex syntax, parentheses () create a numbered capture group which leads to returning the contained matching results. 2) pattern The pattern is a POSIX regular expression for matching. If the pattern does not match, the function returns no rows. Therefore, the likeregex filter is implemented using the POSIX regular expression engine described in Section 9.7.3. PostgreSQL does not currently support the LIKEREGEX operator. The function can return no rows, one row, or multiple rows (see the g flag below). The SQL/JSON standard borrows its definition for regular expressions from the LIKEREGEX operator, which in turn uses the XQuery standard. It has the syntax regexpmatches ( string, pattern, flags ). =# CREATE OR REPLACE FUNCTION perl_regexp_matches ( IN str text, IN pattern text) RETURNS text AS $$ The REGEXPMATCHES () function accepts three arguments: 1) source The source is a string that you want to extract substrings that match a regular expression. The regexpmatches function returns a text array of all of the captured substrings resulting from matching a POSIX regular expression pattern.
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