How to use regular expressions to extract strings in MySQL?

1 year ago
Ava Mitchell
1 minute

In MySQL, you can use the regular expression function REGEXP_SUBSTR to extract part of a string.

The grammar is as follows:

REGEXP_SUBSTR(string, pattern [, position [, occurrence [, match_mode [, match_modifier]]]])

explanation of parameters:

  1. String: the string to be extracted.
  2. Pattern: Regular expression pattern used to match the portion to be extracted.
  3. The position parameter is optional and specifies the starting position for the search, with a default value of 1.
  4. Occurrence: optional parameter specifying the number of the match item to return, default is 1.
  5. match_mode: Optional parameter that specifies the matching mode of the regular expression, with a default value of 0.
  6. match_modifier: optional parameter that specifies the match modifier, defaulting to empty.

Here is an example demonstrating how to use regular expressions to extract substrings:

SELECT REGEXP_SUBSTR('Hello, World!', '[a-z]+') AS result;

The output result is:

Hello

The above example uses the regular expression [a-z]+ to match lowercase letters in the string, so the resulting extraction is “Hello”.

Please note:

  1. Regular Expression Substring
  2. incident
  3. Replace certain patterns in a string using regular expressions in SQL.
  4. Regular Expression Pattern Matching in String
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