Hello a question about ".+?"

[Xi Chen]

Hello everyone,

I have a question about how to translate the meaning of ".+?". Please
see the examples below:
SASI_Hs01_00205058      HUMAN   NM_005762       857     MISSION® siRNA 2       
                 140.00
I want to get number"857", I found the command below works:
perl -ne 'if (/(SASI\w+)(.+?)\s(\d+)\s/) { print "$3\n"; }'
but ".+" or ".*"doesn't work. I don't know why "?" is so important?

Thank you!

Xi

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