3.3 使用 regexp_match 函数 sql SELECT regexp_match('osdba-6-osdba', E'(\\d+)'); -- 返回数组 {6} 3.4 使用 regexp_replace 函数 sql SELECT regexp_replace('osdba-6-osdba', E'(\\d+)', 'X'); -- 返回 'osdba-X-osdba' ...
语法是regexp_matches(string, pattern [, flags ]) 果没有匹配, 则此函数不返回任何行,如果有一个匹配且没有给出g标志,则返回一行; 如果有N个匹配,并给出g标志,则返回N行。 每个返回的行都是一个文本数组,它包含整个匹配的子字符串或匹配 pattern的括号子表达式的子字符串,就像上面针对 regexp_match所描...
EXECUTE format('SELECT CAST(%L AS bigint);',(regexp_match(SUBSTRING(partition_expression from 'FROM \((.*)\) TO'), '[0-9]+'))[1]) INTO lastest_section_p_min_key ; EXECUTE format('SELECT CAST(%L AS bigint);',(regexp_match(SUBSTRING(partition_expression from 'TO \((.*)\)'...
SELECT * FROM `houdunwang` WHERE `uname` LIKE "%后盾%" -- 不走索引 -- 正则表达式不使用索引,这应该很好理解,所以为什么在SQL中很难看到regexp关键字的原因 -- 字符串与数字比较不使用索引; CREATE TABLE `a` (`a` char(10)); EXPLAIN SELECT * FROM `a` WHERE `a`="1" -- 走索引 EXPLAIN ...
> regexp_match() > regexp_matches() > regexp_replace() > regexp_split_to_array() > regexp_split_to_table() > were created in contrib/citext/citext--1.4.sql, we can add the CREATE > OR REPLACE FUNCTION to 1.4.sql. > but to avoid unintended consequences I just add these to the...
proname => 'regexp_match', prorettype => '_text', proargtypes => 'text text', + proargnames => '{string, pattern}', prosrc => 'regexp_match_no_flags' }, { oid => '3397', descr => 'find first match for regexp',
Subject: [PATCH v1 1/1] refactor regexp_replace syntax the status quo syntax: "It has the syntax regexp_replace(string, pattern, replacement [, start [, N ]] [, flags ])." is incorrect. changing it to "It has the syntax regexp_replace(string, pattern, replacement [, flags ]) ...
regexp_replace(sqlerrm, '[0-9]+', 'REDACTED'); + END + $$; + <waiting ...> +step c1: COMMIT; +step sfu3: <... completed> +relhasindex +--- +(0 rows) + +s4: WARNING: got: tuple concurrently deleted +step revoke4: <... completed> +step r3: ROLLBACK; diff --git a...
I decided against it since a. we are interested in dumping > and > > restoring objects left behind by regression, b. I didn't find a way to > > provide the format option to pg_dumpall. The test could be enhanced to > use > > different dump formats. > > > > I have added it...
+CREATE OR REPLACE FUNCTION regexp_match(string citext, pattern citext ) RETURNS TEXT[] AS $$ + SELECT pg_catalog.regexp_match($1::pg_catalog.text, $2::pg_catalog.text, 'i' ); +$$ LANGUAGE SQL IMMUTABLE STRICT PARALLEL SAFE; ...