Hive regexp_extract data

Question

I\'m trying to use regexp_extract on hive.

I have data which is varying in nature, such as:

a2=new something a1=asdasdsad;a2=old something;a3=asadasdsadsa

Answer 1

(?<=a2=)[^;]*(?:;|$)

Try this.See demo.

https://www.regex101.com/r/rC2mH4/7

Answer 2

(?<=a2=)=?([^;\n]*)

I think RegEx101 is pretty helpful for you to understand the logic. I tried the above expression and it seem to work to extract the content for a2 with or without ;.

Answer 3

This simple regex will do the work:

.*a2=?(.*?);

It's your same regex but with only one capturing group (you don't need to capture what it's before the a2 key).