http://qs1969.pair.com?node_id=385198

drock has asked for the wisdom of the Perl Monks concerning the following question:

All, I have tried to delete every line that has the string ID:a-z-0-9 or ID:* and cannot get it to work. Any help would be much appreciated! Here is the data file 
ID:8F03F770.3E6A0B05.00000200.5E0263D7, 
(E00123),       
(E00540),       
(E00216),       
(E00313),       
(E00486),       
(E00112),       
(E00822),       
(E00792),       
(E00774),       
(E00623),       
(E00022),       
(E00188),       
(E00017),       
(E00075),       
(E00055),       
ID:500460E9.BB25AD46.00000200.3E044511,

[download]
I do not want the string ID:* and ideally only Exxxx w.out the ( ) or , thank you!

Replies are listed 'Best First'.
Re: deletion of one line of a particula pattern
by insensate (Hermit) on Aug 23, 2004 at 19:45 UTC 
    while(<DATA>){
  print "$1$/" if /\((E\d+)/;
}

__DATA__
ID:8F03F770.3E6A0B05.00000200.5E0263D7, 
(E00123),       
(E00540),       
(E00216),       
(E00313),       
(E00486),       
(E00112),       
(E00822),       
(E00792),       
(E00774),       
(E00623),       
(E00022),       
(E00188),       
(E00017),       
(E00075),       
(E00055),       
ID:500460E9.BB25AD46.00000200.3E044511,

    [download]
    Should do the trick...assuming all your desired values match E then a number of digits....
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[d/l]
      awesome... I wish I was better at reg exps. my only complaint is the output looks like: 
      (E1234),     E1234
(E4545),     E4545

      [download]
      instead of just 
      Exxxx
Exxxx
Exxxx

      [download]
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[d/l]
[select]
        That's odd... can you provide the snippet of code that's producing that output?
[reply]
Re: deletion of one line of a particula pattern
by ccn (Vicar) on Aug 23, 2004 at 19:56 UTC

    perl -ne "print unless /ID:/" datafile

    update: perl -i.bak -lne "print $1 if /\((E\d+)\)/" datafile

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[d/l]
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