Question

Extract fields using perl

Asked by: emb211

I am trying to extract the information contained between each of the bracket pairs on this text string. The format is the same each time although the information contained between the brackets changes. What I'm looking for is and array with the information. For this example:

LCD1 [SCAN + C 004 ][#### ] LCD2 [ 154.3875 FM ][ ] LCD3 [FIRE 3 E FG ][ ] LCD4 [ FIRE ][ ]

Array[0]-->SCAN + C 004
Array[1]-->####
Array[2]-->154.3875 FM
Array[3]-->null
Array[4]-->FIRE 3 E FG
Array[5]-->null
Array[6]-->FIRE
Array[7]-->null

The LCD1, LCD2, LCD3, LCD4 will be there each time along with the 8 [] but the information between the brackets will could change each time. In this example 3, 5 and 7 are null, but they may not be the next time and there may be other null fields instead. Just in case it helps, the null fields actually do have one space in them.

Thanks for your help.

Ed



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Asked On
2009-11-02 at 19:16:15ID24866018
Tags

perl

Topic

Perl Programming Language

Participating Experts
3
Points
500
Comments
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Answers

 

by: lwadwellPosted on 2009-11-02 at 20:07:16ID: 25725973

Hi emb211,

something like ...


lwadwell

 

by: lwadwellPosted on 2009-11-02 at 20:07:49ID: 25725976

emb211,

my $t = "LCD1 [SCAN + C 004 ][#### ] LCD2 [ 154.3875 FM ][ ] LCD3 [FIRE 3 E FG ][ ] LCD4 [ FIRE ][ ] ";
my @a;
if ( $t =~ /\[(.+)\]/ ) {
    my $x = $1;
    $x =~ s/\]\s+LCD\d\s+\[/][/g;
    @a = split(/\]\[/,$x);
}
print join('...',@a),"\n";

lwadwell

 

by: Adam314Posted on 2009-11-02 at 20:42:33ID: 25726105

There is no null in perl.  Did you want undef for these?  Or a string with blank space?

my $str = 'LCD1 [SCAN + C 004 ][#### ] LCD2 [ 154.3875 FM ][ ] LCD3 [FIRE 3 E FG ][ ] LCD4 [ FIRE ][ ]'; 
### To have blank string
my @f = $str =~ /\[(.*?)\]/g; 
### To have undef
my @f = map {/\S/ ? $_ : undef} $str =~ /\[(.*?)\]/g;
                                              
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Select allOpen in new window

 

by: ozoPosted on 2009-11-02 at 22:10:25ID: 25726402

$_='LCD1 [SCAN + C 004 ][#### ] LCD2 [ 154.3875 FM ][ ] LCD3 [FIRE 3 E FG ][ ] LCD4 [ FIRE ][ ] ';
@Array=/\[\s*(.*?)\s*\]/g;

 

by: emb211Posted on 2009-11-03 at 07:52:10ID: 25730126

lwadwell

I tried your solution but it is returning only the first 2 fields. There should be a total of 8 fields each time.

Info from the debugger:

  DB<3> x \@a
0  ARRAY(0x8634190)
   0  'SCAN + P C 201  '
   1  '####            '

I did some more checking and the input string appears to have a hex 0a prior to LCD2, LCD3 and LCD4 and at the end of the string.

hexdump -C test.log
00000000  4c 43 44 31 20 5b 53 43  41 4e 20 2b 20 20 20 43  |LCD1 [SCAN +   C|
00000010  20 31 32 35 20 20 5d 5b  23 23 23 23 20 20 20 20  | 125  ][####    |
00000020  20 20 20 20 20 20 20 20  5d 0a 4c 43 44 32 20 5b  |        ].LCD2 [|
00000030  20 34 36 30 2e 30 37 35  30 20 4e 46 4d 20 20 20  | 460.0750 NFM   |
00000040  5d 5b 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |][              |
00000050  20 20 5d 0a 4c 43 44 33  20 5b 50 44 20 4e 6f 72  |  ].LCD3 [PD Nor|
00000060  74 68 20 20 20 20 20 20  20 20 5d 5b 20 20 20 20  |th        ][    |
00000070  20 20 20 20 20 20 20 20  20 20 20 20 5d 0a 4c 43  |            ].LC|
00000080  44 34 20 5b 20 20 20 20  53 48 45 52 49 46 46 20  |D4 [    SHERIFF |
00000090  20 20 20 20 5d 5b 20 20  20 20 20 20 20 20 20 20  |    ][          |
000000a0  20 20 20 20 20 20 5d 0a                           |      ].|
000000a8

 

by: emb211Posted on 2009-11-03 at 08:04:02ID: 25730306

Adam314

It looks like
my @f = $str =~ /\[(.*?)\]/g;

does work.

I will try it and let you know.

  DB<3> x \@f
0  ARRAY(0x863413c)
   0  'SCAN +   C 204  '
   1  '####            '
   2  ' 460.1250 NFM   '
   3  '                '
   4  'WEST DSP        '
   5  '                '
   6  '      RPD       '
   7  '                '

 

by: emb211Posted on 2009-11-03 at 08:48:44ID: 25730881

Adam314

Thank you very much, that solved the problem.

 

by: emb211Posted on 2009-11-03 at 08:49:31ID: 31649219

Great job!

20120131-EE-VQP-002

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