Noted that the REGEXP_MATCHES() returns each row as an array, rather than a string. ![]() The result set has two rows, each is an array, which indicates that there are two matches. ![]() The following is the result: regexp_matches The g flag argument is for the global search. In this example, the following regular expression matches any word that starts with the hash character ( #) and is followed by any alphanumeric characters or underscore ( _). 'g') Code language: JavaScript ( javascript ) REGEXP_MATCHES( 'Learning #PostgreSQL #REGEXP_MATCHES', The following statement allows you to extract the hashtags such as PostgreSQL and REGEXP_MATCHES: SELECT Suppose, you have a social networking’s post as follows: 'Learning #PostgreSQL #REGEXP_MATCHES' Code language: JavaScript ( javascript ) The REGEXP_MATCHES() function returns a set of text, even if the result array only contains a single element. For example, i allows you to match case-insensitively. The flags argument is one or more characters that control the behavior of the function. The pattern is a POSIX regular expression for matching. The source is a string that you want to extract substrings that match a regular expression. The REGEXP_MATCHES() function accepts three arguments: The following illustrates the syntax of the PostgreSQL REGEXP_MATCHES() function: REGEXP_MATCHES( source_string, pattern ) Code language: CSS ( css ) Arguments ![]() The PostgreSQL REGEXP_MATCHES() function matches a regular expression against a string and returns matched substrings.
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