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PostgreSQL – REGEXP_MATCHES Function

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  • Difficulty Level : Hard
  • Last Updated : 07 Oct, 2022
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The PostgreSQL REGEXP_MATCHES() function is used to match a POSIX regular expression against a string and subsequently returns the strings that match the pattern.

Syntax:REGEXP_MATCHES(source_string, pattern [, flags])

Let’s analyze the above syntax:

  • The source is a string from which the regular expression matches and returns the substring.
  • The pattern is a POSIX regular expression for matching the source string.
  • The flags argument handles the function when more than one character matches the pattern.
  • The REGEXP_MATCHES() function returns the queried string based on the matches.

Example 1:

Suppose, you have a social networking’s post as follows:

'Learning #Geeksforgeeks #geekPower'

The following statement allows you to extract the hashtags such as Geeksforgeeks and geekPower:

    REGEXP_MATCHES('Learning #Geeksforgeeks #geekPower', 


Example 2:

This is common for all patterns that can be matched using the Regular Expressions as shown in the below example:

SELECT REGEXP_MATCHES('ABC', '^(A)(..)$', 'g');


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