ISO/IEC TR 19075-1:2011 describes the regular expression support in SQL adopted from the regular expression syntax of _XQuery 1.0 and XPath 2.0 Functions and Operators (Second Edition)_, which is derived from Perl. It discusses five operators using this regular expression syntax:

* LIKE_REGEX predicate, to determine the existence of a match to a regular expression.

* OCCURRENCES_REGEX numeric function, to determine the number of matches to a regular expression.

* POSITION_REGEX function, to determine the position of a match.

* SUBSTRING_REGEX function, to extract a substring matching a regular expression.

* TRANSLATE_REGEX function, to perform replacements using a regular expression.