Help Center/ Data Lake Insight/ SQL Syntax Reference (To Be Offline)/ Spark SQL Syntax Reference (Unavailable Soon)/ Built-in Functions/ String Functions/ regexp_replace1
Updated on 2024-11-08 GMT+08:00
View PDF
Share

regexp_replace1

This function is used to replace the substring that matches pattern for the occurrence time in the source string with the specified string replace_string and return the result string.

This function applies only to Spark 2.4.5 or earlier.

Similar function: regexp_replace. The regexp_replace function has slightly different functionalities for different versions of Spark. For details, see regexp_replace.

Syntax

regexp_replace1(string <source>, string <pattern>, string <replace_string>[, bigint <occurrence>])

Parameters

Table 1 Parameters

Parameter

Mandatory

Type

Description

source

Yes

STRING

String to be replaced

pattern

Yes

STRING

Constant or regular expression of the STRING type. Pattern to be matched. For more guidelines on writing regular expressions, refer to the regular expression specifications. If the value of this parameter is an empty string, an error is reported.

replace_string

Yes

STRING

String that replaces the one matching the pattern parameter

occurrence

No

BIGINT

The value must be greater than or equal to 1, indicating that the string that is matched for the occurrence time is replaced with replace_string. When the value is 1, all matched substrings are replaced. If the value is of another type or is less than 1, an error is reported. The default value is 1.

Return Values

The return value is of the STRING type.

  • If a group that does not exist is referenced, the group is not replaced.
  • If the value of replace_string is NULL and the pattern is matched, NULL is returned.
  • If the value of replace_string is NULL but the pattern is not matched, NULL is returned.
  • If the value of source, pattern, or occurrence is NULL, NULL is returned.

Example Code

The value 2222 is returned.

select regexp_replace1('abcd', '[a-z]', '2');

The value 2bcd is returned.

select regexp_replace1('abcd', '[a-z]', '2', 1);

The value a2cd is returned.

select regexp_replace1('abcd', '[a-z]', '2', 2);

The value ab2d is returned.

select regexp_replace1('abcd', '[a-z]', '2', 3);

The value abc2 is returned.

select regexp_replace1('abcd', '[a-z]', '2', 4);
Parent topic: String Functions