![]() Flag g causes the function to find each match in the string, not only the first one, and return a row for each such match. Regular expressions (REs), as defined in POSIX 1003.2, come in two forms: extended REs or EREs (roughly those of egrep), and basic REs or BREs (roughly. Much of the description of regular expressions below is copied verbatim from his manual. 3 Answers Sorted by: 47 If you're trying to capture the regex match that resulted from the expression, then substring would do the trick: select substring ('I have a dog', 'd aeioug') Would return any match, in this case 'dog. The flags parameter is an optional text string containing zero or more single-letter flags that change the function's behavior. PostgreSQL 's regular expressions are implemented using a software package written by Henry Spencer. If the pattern contains parenthesized subexpressions, the function returns a text array whose n'th element is the substring matching the n'th parenthesized subexpression of the pattern (not counting "non-capturing" parentheses see below for details). If the pattern contains no parenthesized subexpressions, then each row returned is a single-element text array containing the substring matching the whole pattern. If the pattern does not match, the function returns no rows. The function can return no rows, one row, or multiple rows (see the g flag below). It has the syntax regexp_matches(string, pattern ). The regexp_matches function returns a text array of all of the captured substrings resulting from matching a POSIX regular expression pattern. SELECT regexp_matches(column,'^stuff.*$')
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