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ZhangYu0123 1d9b3aeee7 [Doc] Repair document format (#4336 )

The error format '##keyword' in a lot of docs. This pr is to repair document format. #4335

2020-08-13 23:39:41 +08:00

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title, language

title	language
regexp_extract	zh-CN

regexp_extract

description

Syntax

VARCHAR regexp_extract(VARCHAR str, VARCHAR pattern, int pos)

对字符串 str 进行正则匹配，抽取符合 pattern 的第 pos 个匹配部分。需要 pattern 完全匹配 str 中的某部分，这样才能返回 pattern 部分中需匹配部分。如果没有匹配，返回空字符串。

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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