This document describes the regular expression support in SQL (ISO/IEC 9075-2) adopted from the
regular expression syntax of XQuery and XPath Functions and Operators 3.1, which is derived from Perl.
This document 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.