Get last matched value after backslash in Hive-CodePudding

I want to extract the last part of the path. For eg if my path is:

\\abc.ksiw.com\POP-K-DRIVE\project-app\cname\554789A

I want 554789A as output.

I tried with regexp_extract(col, '[\\w ] $',0) but that does not work. Is there a better way to do this?

CodePudding user response：

This works:

regexp_extract(col,'([^\\\\]*)$',1)

Backslash is special character both in Hive and in regex.

Four back slashes is used to represent a single backslash in regex.

If you want to test on literal constant, use two backslashes instead of one in literal and four in regexp:

select regexp_extract('\\\\abc.ksiw.com\\POP-K-DRIVE\\project-app\\cname\\554789A','([^\\\\]*)$',1);

Result:

554789A

(\\w )$ also works:

regexp_extract(col,'(\\w )$',1)