REGEXP_REPLACE Function Syntax | Teradata Vantage - 17.10 - REGEXP_REPLACE Function Syntax - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - SQL Functions, Expressions, and Predicates

Advanced SQL Engine
Teradata Database
Release Number
July 2021
English (United States)
Last Update
[TD_SYSFNLIB.] REGEXP_REPLACE ( source_string, regexp_string
  [, replace_string, position_arg, occurrence_arg, match_arg ] )

Syntax Elements

Name of the database where the function is located.
A character argument.
If source_string is NULL, NULL is returned.
A character argument.
If regexp_string is NULL, NULL is returned.
A character argument.
If a replace_string is not specified, is NULL or is an empty string, the matches are removed from the result.
The maximum backreference number in a replace_string is 9 (for example, \9). Any backreference in the replace_string that is higher than 9 is considered a backreference.
A numeric argument.
position_arg specifies the position in source_string from which to start searching (default is 1).
If position_arg is greater than the input string length, NULL is returned.
If position_arg is NULL, the value NULL is used. If position_arg is not specified, the default (1) is used.
A numeric argument.
Specifies the occurrence to replace the match with replace_string.
  • If a value of 0 is specified, all occurrences are replaced.
  • If the value is greater than 1, the search begins for the second occurrence beginning with the first character following the first occurrence of the regexp_string, and so on.
If occurrence_arg is greater than the number of matches found, nothing is replaced and source_string is returned.
If occurrence_arg is NULL, a NULL result is returned. If occurrence_arg is omitted, 0 is the default value.

A character argument.

The argument can contain more than one character. If a character in the argument is not valid, then that character is ignored.
If match_arg is not specified, is NULL, or is empty:
  • The match is case-sensitive.
  • A period does not match the newline character.
  • source_string is treated as a single line.
  • 'i' = case-insensitive matching.
  • 'c' = case-sensitive matching.
  • 'n' = the period character (match any character) can match the newline character.
  • 'm' = source_string is treated as multiple lines instead of as a single line. With this option, the '^' and '$' characters apply to each line in source_string instead of the entire source_string.
  • 'l' = For a CLOB data type, if source_string exceeds the current maximum allowed source_string size (currently 16 MB), a NULL is returned instead of an error. This is useful for long-running queries where you do not want long strings causing an error that would make the query fail. You can only specify this option for a CLOB data type.
  • 'x' = ignore whitespace.