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-- regexp_count_pattern_fix: replace any occurence of a dot into a [^\n] pattern.
CREATE OR REPLACE FUNCTION oracle.regexp_count_pattern_fix(text)
RETURNS text
AS $$
DECLARE
v_pattern text;
BEGIN
-- Replace any occurences of a dot by [^\n]
-- to have the same behavior as Oracle
v_pattern := regexp_replace($1, '\\\.', '#ESCDOT#', 'g');
v_pattern := regexp_replace(v_pattern, '\.', '[^\n]', 'g');
v_pattern := regexp_replace(v_pattern, '#ESCDOT#', '\.', 'g');
RETURN v_pattern;
END;
$$
LANGUAGE plpgsql IMMUTABLE STRICT PARALLEL SAFE;
-- REGEXP_COUNT( string text, pattern text ) -> integer
CREATE OR REPLACE FUNCTION oracle.regexp_count(text, text)
RETURNS integer
AS $$
-- Oracle default behavior is newline-sensitive,
-- PostgreSQL not, so force 'p' modifier to affect
-- newline-sensitivity but not ^ and $ search.
SELECT count(*)::integer FROM regexp_matches($1, oracle.regexp_count_pattern_fix($2), 'sg');
$$
LANGUAGE 'sql' STRICT IMMUTABLE PARALLEL SAFE;
-- REGEXP_COUNT( string text, pattern text, position int ) -> integer
CREATE OR REPLACE FUNCTION oracle.regexp_count(text, text, integer)
RETURNS integer
AS $$
DECLARE
v_cnt integer;
v_pattern text;
BEGIN
-- Check numeric arguments
IF $3 < 1 THEN
RAISE EXCEPTION 'argument ''position'' must be a number greater than 0';
END IF;
v_pattern := '(' || oracle.regexp_count_pattern_fix($2) || ')';
-- Oracle default behavior is newline-sensitive,
-- PostgreSQL not, so force 's' modifier to affect
-- newline-sensitivity but not ^ and $ search.
v_cnt := (SELECT count(*)::integer FROM regexp_matches(substr($1, $3), v_pattern, 'sg'));
RETURN v_cnt;
END;
$$
LANGUAGE plpgsql STRICT IMMUTABLE PARALLEL SAFE;
-- REGEXP_COUNT( string text, pattern text, position int ) -> integer
CREATE OR REPLACE FUNCTION oracle.regexp_count(text, text, integer)
RETURNS integer
AS $$
DECLARE
v_cnt integer;
BEGIN
-- Check numeric arguments
IF $3 < 1 THEN
RAISE EXCEPTION 'argument ''position'' must be a number greater than 0';
END IF;
-- Oracle default behavior is newline-sensitive,
-- PostgreSQL not, so force 'p' modifier to affect
-- newline-sensitivity but not ^ and $ search.
v_cnt := (SELECT count(*)::integer FROM regexp_matches(substr($1, $3), oracle.regexp_count_pattern_fix($2), 'sg'));
RETURN v_cnt;
END;
$$
LANGUAGE plpgsql STRICT IMMUTABLE PARALLEL SAFE;
-- REGEXP_COUNT( string text, pattern text, position int, flags text ) -> integer
CREATE OR REPLACE FUNCTION oracle.regexp_count(text, text, integer, text)
RETURNS integer
AS $$
DECLARE
modifiers text;
v_cnt integer;
BEGIN
-- Only modifier can be NULL
IF $1 IS NULL OR $2 IS NULL OR $3 IS NULL THEN
RETURN NULL;
END IF;
-- Check numeric arguments
IF $3 < 1 THEN
RAISE EXCEPTION 'argument ''position'' must be a number greater than 0';
END IF;
modifiers := oracle.translate_oracle_modifiers($4, true);
v_cnt := (SELECT count(*)::integer FROM regexp_matches(substr($1, $3), $2, modifiers));
RETURN v_cnt;
END;
$$
LANGUAGE plpgsql IMMUTABLE PARALLEL SAFE;
-- REGEXP_SUBSTR( string text, pattern text ) -> text
CREATE OR REPLACE FUNCTION oracle.regexp_substr(text, text)
RETURNS text
AS $$
DECLARE
v_substr text;
v_pattern text;
BEGIN
-- Without subexpression specified, assume 0 which mean that the first
-- position for the substring matching the whole pattern is returned.
-- We need to enclose the pattern between parentheses.
v_pattern := '(' || $2 || ')';
-- Oracle default behavior is newline-sensitive,
-- PostgreSQL not, so force 'p' modifier to affect
-- newline-sensitivity but not ^ and $ search.
v_substr := (SELECT (regexp_matches($1, v_pattern, 'sg'))[1] OFFSET 0 LIMIT 1);
RETURN v_substr;
END;
$$
LANGUAGE plpgsql STRICT IMMUTABLE PARALLEL SAFE;
-- REGEXP_SUBSTR( string text, pattern text, position int ) -> text
CREATE OR REPLACE FUNCTION oracle.regexp_substr(text, text, int)
RETURNS text
AS $$
DECLARE
v_substr text;
v_pattern text;
BEGIN
-- Check numeric arguments
IF $3 < 1 THEN
RAISE EXCEPTION 'argument ''position'' must be a number greater than 0';
END IF;
-- Without subexpression specified, assume 0 which mean that the first
-- position for the substring matching the whole pattern is returned.
-- We need to enclose the pattern between parentheses.
v_pattern := '(' || $2 || ')';
-- Oracle default behavior is newline-sensitive,
-- PostgreSQL not, so force 'p' modifier to affect
-- newline-sensitivity but not ^ and $ search.
v_substr := (SELECT (regexp_matches(substr($1, $3), v_pattern, 'sg'))[1] OFFSET 0 LIMIT 1);
RETURN v_substr;
END;
$$
LANGUAGE plpgsql STRICT IMMUTABLE PARALLEL SAFE;
-- REGEXP_SUBSTR( string text, pattern text, position int, occurence int ) -> text
CREATE OR REPLACE FUNCTION oracle.regexp_substr(text, text, integer, integer)
RETURNS text
AS $$
DECLARE
v_substr text;
v_pattern text;
BEGIN
-- Check numeric arguments
IF $3 < 1 THEN
RAISE EXCEPTION 'argument ''position'' must be a number greater than 0';
END IF;
IF $4 < 1 THEN
RAISE EXCEPTION 'argument ''occurence'' must be a number greater than 0';
END IF;
-- Without subexpression specified, assume 0 which mean that the first
-- position for the substring matching the whole pattern is returned.
-- We need to enclose the pattern between parentheses.
v_pattern := '(' || $2 || ')';
-- Oracle default behavior is newline-sensitive,
-- PostgreSQL not, so force 'p' modifier to affect
-- newline-sensitivity but not ^ and $ search.
v_substr := (SELECT (regexp_matches(substr($1, $3), v_pattern, 'sg'))[1] OFFSET $4 - 1 LIMIT 1);
RETURN v_substr;
END;
$$
LANGUAGE plpgsql STRICT IMMUTABLE PARALLEL SAFE;
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