How to use the replacement function in oracle

Three replacement functions are provided in Oracle: REPLACE, TRANSLATE and REGEXP_REPLACE. The REPLACE function replaces a specific substring, the TRANSLATE function replaces a set of characters, and the REGEXP_REPLACE function uses regular expressions for substring replacement.

How to use replacement functions in Oracle

Oracle provides several replacement functions for replacing strings specific substring in . These functions are useful for data cleaning and manipulation tasks.

REPLACE Function

The REPLACE function replaces a specific substring in a string with another substring. The syntax is as follows:

REPLACE(string, old_string, new_string)

Among them:

• string contains the string to be replaced substring of strings.
• old_string is the substring to be replaced.
• new_string is the new substring that replaces old_string.

Example:

<code class="sql">SELECT REPLACE('John Smith', 'Smith', 'Doe') FROM dual;</code>

Result:

<code>John Doe</code>

TRANSLATE function

TRANSLATE function replacement One set of characters in a string is another set of characters. The syntax is as follows:

TRANSLATE(string, old_chars, new_chars)

Among them:

• string contains the words to be translated A string of characters.
• old_chars is the character set to be replaced.
• new_chars is the new character set that replaces old_chars.

Example:

<code class="sql">SELECT TRANSLATE('ABCDEFG', 'ABD', 'xyz') FROM dual;</code>

Result:

<code>xyzCDEFG</code>

REGEXP_REPLACE function

REGEXP_REPLACE function usage Regular expression to replace substrings in a string. The syntax is as follows:

REGEXP_REPLACE(string, pattern, replacement)

where:

• string contains the string to be replaced substring of strings.
• pattern is the regular expression to match.
• replacement is a new substring that replaces the matching substring.

Example:

<code class="sql">SELECT REGEXP_REPLACE('123-456-7890', '[0-9]', 'X') FROM dual;</code>

Result:

<code>XXX-XXX-XXXX</code>

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