Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things
 
PerlMonks  

Re^3: [Solved]Need to extract a particular block of lines between two patterns

by AnomalousMonk (Bishop)
on Nov 11, 2017 at 02:31 UTC ( #1203160=note: print w/replies, xml ) Need Help??


in reply to Re^2: [Solved]Need to extract a particular block of lines between two patterns
in thread [Solved]Need to extract a particular block of lines between two patterns

... why the third line is 3E0 and what does that stand for?

From the discussion of Range Operators in scalar context (the "flip-flop" operator):

The right operand is not evaluated while the operator is in the "false" state, and the left operand is not evaluated while the operator is in the "true" state. ... The value returned is either the empty string for false, or a sequence number (beginning with 1) for true. The sequence number is reset for each range encountered. The final sequence number in a range has the string "E0" appended to it, which doesn't affect its numeric value, but gives you something to search for if you want to exclude the endpoint.
[Emphases added]
So IOW, the final sequence number matches  qr{ \A \d+ E0 \z }xms See also The Scalar Range Operator ("Exluding Markers" section) and Flipin good, or a total flop? (specifically Re: Flipin good, or a total flop?), both in the Monastery's Tutorials section.


Give a man a fish:  <%-{-{-{-<

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1203160]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others meditating upon the Monastery: (5)
As of 2020-09-19 19:51 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    If at first I donít succeed, I Ö










    Results (115 votes). Check out past polls.

    Notices?