What is the usage of the replace function in Oracle?

The REPLACE function in Oracle is used to replace a specified portion of a string. Its syntax is as follows:

Would you please replace the original string with this new one?

Description of parameters:

1. source string: the original string that needs to be replaced.
2. search_string: the part of the string that needs to be replaced.
3. replacement_string: the string used for replacement.

The function returns the replaced result string.

Example of usage:

1. Replace a single character.
2. The output is “Helli”.
3. Replace multiple characters:
4. The output will be “Heyyo” when replacing ‘l’ with ‘y’ in the word ‘Hello’.
5. Replace a substring in a string.
6. The output of the following code will be “Helli, Wirld!”
7. Using the REPLACE function multiple times in a row:
8. The result of the output is “Heyyi”

Important Note:

1. The REPLACE function is case-sensitive, if you need to be case-insensitive, you can use the LOWER or UPPER function for conversion.
2. If the replacement_string parameter is empty, the part matched by the search_string will be deleted.
3. If the search_string parameter is empty, the original string will be returned.
4. The REPLACE function only replaces the first matching part, if you need to replace all matching parts, you can use the REGEXP_REPLACE function.