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> Mirror of <https://developer.salesforce.com/docs/data/data-cloud-query-guide/references/dc-sql-reference/regexp-substr.html> (Salesforce, Data 360 Query Guide), read 2026-10-23. Salesforce's own page is the authority; this copy exists because that site refuses non-browser readers.

## `REGEXP_SUBSTR`

**Applies to:** ✅ Data 360 SQL ✅ Tableau Hyper API

Returns the substring matching a regular expression pattern.

*   `<string>`: The string to search within.
*   `<pattern>`: The regular expression pattern to match.

Returns a text value containing the matched substring, or `NULL` if no match is found.

*   Returns the first match when multiple matches exist.
*   For detailed regex syntax, see [Regular Expression Syntax](https://developer.salesforce.com/docs/data/data-cloud-query-guide/references/dc-sql-reference/string-matching.html#regular-expression-syntax).

Extract a sequence of digits from a string.

Returns `'123'`.

Returns NULL when pattern is not found.

Returns `NULL`.

Extract the domain from an email address.

Returns `'@example.com'`.

Extract a word pattern.

Returns `'$99.99'`, because the digit string is considered a word.

Provide a default when no match.

Returns the matched digits or ‘0’ if none are found.

*   [SUBSTRING](https://developer.salesforce.com/docs/data/data-cloud-query-guide/references/dc-sql-reference/substring.html)
*   [REGEXP_INSTR](https://developer.salesforce.com/docs/data/data-cloud-query-guide/references/dc-sql-reference/regexp-instr.html)
*   [REGEXP_REPLACE](https://developer.salesforce.com/docs/data/data-cloud-query-guide/references/dc-sql-reference/regexp-replace.html)
*   [Regular Expression Syntax](https://developer.salesforce.com/docs/data/data-cloud-query-guide/references/dc-sql-reference/string-matching.html#regular-expression-syntax)


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