SUB_REPLACE

Description

The sub_replace function is used to replace substrings within a string. You can specify the substring to be replaced and the target string to replace it with. It returns a new string where the substring starting from start with length len in str is replaced by new_str. If start or len is a negative integer, it returns NULL. The default value for len is the length of new_str.

Syntax

sub_replace(<str>, <new_str>, [ ,<start> [ , <len> ] ])

Parameters

Parameter	Description
<str>	The target string in which the replacement will occur
<new_str>	The string that will replace the specified substring
<start>	start is the position where the replacement operation begins, indicating from which position in the string the replacement will start
<len>	len is an optional parameter that specifies the length of the substring to be replaced

Return Value

Returns the string after replacement.

Examples

select sub_replace("this is origin str","NEW-STR",1);

+-------------------------------------------------+
| sub_replace('this is origin str', 'NEW-STR', 1) |
+-------------------------------------------------+
| tNEW-STRorigin str                              |
+-------------------------------------------------+

select sub_replace("doris","***",1,2);

+-----------------------------------+
| sub_replace('doris', '***', 1, 2) |
+-----------------------------------+
| d***is                            |
+-----------------------------------+