Beefy Boxes and Bandwidth Generously Provided by pair Networks
more useful options

Re: Question about regex.

by Cristoforo (Curate)
on Sep 29, 2020 at 03:36 UTC ( #11122316=note: print w/replies, xml ) Need Help??

in reply to Question about regex.

Here is another approach. It keeps the blank lines after the text (if you need to separate records like they are in the testlines.txt file).

It reads the file to be parsed from the command line following the program invocation. ( perl testlines.txt )

It also places the local statement and the code inside a block to limit the changes to $/ to the block. Although this is not necessary for this small program, in a larger program, this will restore $/ to \n after the block is finished for any code that could follow.

#!/usr/bin/perl use strict; use warnings; @ARGV == 1 or print "Usage: perl $0 testlines.txt\n" and exit; { local $/ = "\n\n"; print grep /\b(?:third|four)\b/i, <>; }

My command prompt:

C:\Old_Data\perlp>perl testlines.txt This is line one. Line Two is this. Third line starts here. This is line four.

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://11122316]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others perusing the Monastery: (4)
As of 2021-06-24 19:39 GMT
Find Nodes?
    Voting Booth?
    What does the "s" stand for in "perls"? (Whence perls)

    Results (132 votes). Check out past polls.