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EmmyMiao87 15c5896f41 [Docs] Add like, regexp function documents (#6182 )

* [Docs] Add like, regexp function documents

* Reconstruct

* Fix compile error

2021-07-15 13:16:21 +08:00

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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

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