Matches a pattern in the input string and replaces the first matched portion (from the left) with the specified replacement.

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Syntax

REGEXP_REPLACE(<input>, <pattern>, <replacement>)

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REGEXP_REPLACE_ALL

Matches a pattern in the input string and replaces all matched portions with the specified replacement.

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Syntax

REGEXP_REPLACE_ALL(<input>, <pattern>, <replacement>)

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Parameters

ParameterDescriptionSupported input types
<input>The string to search for a matching patternTEXT
<pattern>An RE2 regular expression for matching with the string input.TEXT
<replacement>The string to replace the matching pattern found in the input. This argument can include the following special sequences:
* \& - To indicate that the substring matching the entire pattern should be inserted.
* \n - Where n is a digit from 1 to 9, to indicate that the substring matching the n’th capturing group (parenthesized subexpression) of the pattern should be inserted. If pattern doesn’t have n capturing groups, the \n is ignored.
* \\ - results in a single <br/>* \c - Specifies for any other character, c results in the same sequence \c
Note, that for string literals the above escaping rules apply after string literals escaping rules for \. See examples below.		TEXT
If any of the arguments to these functions is NULL, the return value is NULL.

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Return Type

TEXT

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Examples

Replace first occurrence of ! with !!! 
SELECT REGEXP_REPLACE('Hello, world!', '!', '!!!');
Returns: 'Hello, world!!!' Remove leading and trailing spaces 
SELECT REGEXP_REPLACE_ALL('     Hello world ! ', '^[ ]+|[ ]+$', '');
Returns: 'Hello world !' Duplicate every character 
SELECT REGEXP_REPLACE_ALL('Hello, World!', '.', '\&\&')
Returns: 'HHeelllloo,, WWoorrlldd!!' Mask email address by leaving first character only (Note: this is for illustrative purposes only, the email matching pattern is too simplistic) 
SELECT REGEXP_REPLACE(email, '(\w)[\w\.]+@([\w]+\.)+([\w]+)', '\1***@\2\3')
FROM UNNEST([
  'matt123@hotmail.com',
  'joe.doe@gmail.com',
  '12345@www.atg.wa.gov'
]) email
Returns: 
'm***@hotmail.com'
'j***@gmail.com'
'1***@www.atg.wa.gov'
Convert dates into US format 
SELECT REGEXP_REPLACE(event_date::TEXT, '(\d{4})-(\d{2})-(\d{2})', '\2/\3/\1')
FROM UNNEST([
  DATE '1970-08-07',
  DATE '2000-04-22',
  DATE '2002-07-25',
  DATE '2010-11-11'
]) event_date
Returns 
08/07/1970
04/22/2000
07/25/2002
11/11/2010