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Updated on 2023-10-25 GMT+08:00
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regexp_count

This function is used to return the number of substrings that match a specified pattern in the source, starting from the start_position position.

Syntax

regexp_count(string <source>, string <pattern>[, bigint <start_position>])

Parameters

Table 1 Parameters

Parameter

Mandatory

Type

Description

source

Yes

STRING

String to be searched for. For other types, an error is reported.

pattern

Yes

STRING

Constant or regular expression of the STRING type. Pattern to be matched. If the value of this parameter is an empty string or of other types, an error is reported.

start_position

No

BIGINT

Constant of the BIGINT type. The value must be greater than 0. If the value is of another type or is less than or equal to 0, an error is reported. If this parameter is not specified, the default value 1 is used, indicating that the matching starts from the first character of source.

Return Values

The return value is of the BIGINT type.

  • If no match is found, 0 is returned.
  • If the value of source or pattern is NULL, NULL is returned.

Example Code

The value 4 is returned.

select regexp_count('ab0a1a2b3c', '[0-9]');

The value 3 is returned.

select regexp_count('ab0a1a2b3c', '[0-9]', 4);

The value null is returned.

select regexp_count('ab0a1a2b3c', null);
Parent topic: String Functions