1d9b3aeee7
The error format '##keyword' in a lot of docs. This pr is to repair document format. #4335
2.0 KiB
2.0 KiB
title, language
| title | language |
|---|---|
| regexp_extract | en |
regexp_extract
Description
Syntax
'VARCHAR regexp 'extract (VARCHAR str, VARCHAR pattern, int pos)
The string STR is matched regularly and the POS matching part which conforms to pattern is extracted. Patterns need to match exactly some part of the STR to return to the matching part of the pattern. If there is no match, return an empty string.
example
mysql> SELECT regexp_extract('AbCdE', '([[:lower:]]+)C([[:lower:]]+)', 1);
+-------------------------------------------------------------+
| regexp_extract('AbCdE', '([[:lower:]]+)C([[:lower:]]+)', 1) |
+-------------------------------------------------------------+
| b |
+-------------------------------------------------------------+
mysql> SELECT regexp_extract('AbCdE', '([[:lower:]]+)C([[:lower:]]+)', 2);
+-------------------------------------------------------------+
| regexp_extract('AbCdE', '([[:lower:]]+)C([[:lower:]]+)', 2) |
+-------------------------------------------------------------+
| d |
+-------------------------------------------------------------+
keyword
REGEXP_EXTRACT,REGEXP,EXTRACT