Dylan He created FLINK-35932:
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Summary: Add REGEXP_COUNT function
Key: FLINK-35932
URL: https://issues.apache.org/jira/browse/FLINK-35932
Project: Flink
Issue Type: Sub-task
Components: Table SQL / API
Reporter: Dylan He
Add REGEXP_COUNT function.
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Returns the number of times {{str}} matches the {{regexp}} pattern.
Example:
{code:sql}
> SELECT REGEXP_COUNT('Steven Jones and Stephen Smith are the best players',
> 'Ste(v|ph)en');
2
> SELECT REGEXP_COUNT('Mary had a little lamb', 'Ste(v|ph)en');
0
{code}
Syntax:
{code:sql}
REGEXP_COUNT(str, regexp)
{code}
Arguments:
* {{str}}: A STRING expression to be matched.
* {{regexp}}: A STRING expression with a matching pattern.
Returns:
An INTEGER.
{{regexp}} must be a Java regular expression.
When using literals, use `raw-literal` (`r` prefix) to avoid escape character
pre-processing.
If either argument is {{NULL}}, the result is {{NULL}}.
See also:
*
[Spark|https://spark.apache.org/docs/3.5.1/sql-ref-functions-builtin.html#string-functions]
*
[Databricks|https://docs.databricks.com/en/sql/language-manual/functions/regexp_count.html]
* [PostgreSQL|https://www.postgresql.org/docs/16/functions-string.html]
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