PostgreSQL substring()函数，

PostgreSQL substring()函数，

substring(string [from int] [for int])	text	抽取子字串	substring('Thomas' from 2 for 3)	hom
substring(string from pattern)	text	抽取匹配 POSIX 正则表达式的子字串	substring('Thomas' from '...$')	mas
substring(string from pattern for escape)	text	抽取匹配SQL正则表达式的子字串	substring('Thomas' from '%#"o_a#"_' for '#')	oma

例子1.

SELECT id, substring(description from '{zh=([^}]+)/}') as description,type FROM t order by id limit  15 offset 0