#REGEX REPLACE SOFTWARE#
For Tableau extracts, regular expression syntax conforms to the standards of the current International Components for Unicode (ICU), an open source project of mature C/C++ and Java libraries for Unicode support, software internationalization, and software globalization. This function is available for Text File, Hadoop Hive, Google BigQuery, PostgreSQL, Tableau Data Extract, Microsoft Excel, Salesforce, Vertica, Pivotal Greenplum, Teradata (version 14.1 and above), Snowflake, and Oracle data sources.įor Tableau data extracts, the pattern and the replacement must be constants.įor information on regular expression syntax, see your data source's documentation. Returns a copy of the given string where the regular expression pattern is replaced by the replacement string. '(])', '\3.\2.REGEXP_REPLACE(string, pattern, replacement) Oracle reformats this pattern with ( xxx) xxx- xxxx. The following example examines phone_number, looking for the pattern xxx. Refer to REGEXP_COUNT for detailed information. The behavior of this parameter is the same for this function as for REGEXP_COUNT. Match_param is a character expression of the data type VARCHAR2 or CHAR that lets you change the default matching behavior of the function. This behavior is different from the INSTR function, which begins its search for the second occurrence at the second character of the first occurrence. If occurrence is greater than 1, then the database searches for the second occurrence beginning with the first character following the first occurrence of pattern, and so forth. If you specify a positive integer n, then Oracle replaces the nth occurrence. If you specify 0, then Oracle replaces all occurrences of the match. Occurrence is a nonnegative integer indicating the occurrence of the replace operation: The default is 1, meaning that Oracle begins the search at the first character of source_char. Position is a positive integer indicating the character of source_char where Oracle should begin the search. For more information on backreference expressions, refer to the notes to " Oracle Regular Expression Support", Table D-1. For example, to replace \2 you would enter \\2. If you want to include a backslash ( \) in replace_string, then you must precede it with the escape character, which is also a backslash. The replace_string can contain up to 500 backreferences to subexpressions in the form \n, where n is a number from 1 to 9. If replace_string is a CLOB or NCLOB, then Oracle truncates replace_string to 32K. Replace_string can be of any of the data types CHAR, VARCHAR2, NCHAR, NVARCHAR2, CLOB, or NCLOB. For a listing of the operators you can specify in pattern, refer to Oracle Regular Expression Support. If the data type of pattern is different from the data type of source_char, then Oracle Database converts pattern to the data type of source_char. It is usually a text literal and can be of any of the data types CHAR, VARCHAR2, NCHAR, or NVARCHAR2. It is commonly a character column and can be of any of the data types CHAR, VARCHAR2, NCHAR, NVARCHAR2, CLOB or NCLOB. Source_char is a character expression that serves as the search value. For more information, refer to Oracle Regular Expression Support.
This function complies with the POSIX regular expression standard and the Unicode Regular Expression Guidelines. The function returns VARCHAR2 if the first argument is not a LOB and returns CLOB if the first argument is a LOB. The string returned is in the same character set as source_char. By default, the function returns source_char with every occurrence of the regular expression pattern replaced with replace_string. REGEXP_REPLACE extends the functionality of the REPLACE function by letting you search a string for a regular expression pattern.
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