从字符串中删除特殊字符和字母，db2 中 sql 查询中的数字除外

Question

Hi I tried using Regex_replace and it is still not working.

select CASE WHEN sbbb <> ' ' THEN regexp_replace(sbbb,'[a-zA-Z _-#]',''] ELSE sbbb AS ABCDF from Table where sccc=1;

This is the query which I am using to remove alphabets and specials characters from string and have only numbers. but it doesnot work. Query returns me the complete string with numbers,characters and special characters .What is wrong in the above query

I am working on a sql query. There is a column in database which contains characters,special characters and numbers. I want to only keep the numbers and remove all the special characters and alphabets. How can I do it in query of DB2. If a use PATINDEX it is not working. please help here.

Answer 1

The allowed regular expression patterns are listed on this page

Regular expression control characters

Outside of a set, the following must be preceded with a backslash to be treated as a literal

* ? + [ ( ) { } ^ $ | \\ . /

Inside a set, the follow must be preceded with a backslash to be treated as a literal

Characters that must be quoted to be treated as literals are [ ] \\ Characters that might need to be quoted, depending on the context are - &

So for you, this should work

regexp_replace(sbbb,'[a-zA-Z _\-#]','')