regex issue

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

Question

I am trying to print from line 2 to line 6

 #!/usr/bin/perl
    use strict;
    while(my $inp = <DATA>){
    if ($inp =~ /^Lesle/ && /43500$/){
    print "$inp\n";
    }}
   

__DATA__
 41 Tommy Savage:408–724–0140: 12 2 2 Oxbow Court, Sunnyvale, CA 94087
+: 5/19/66: 34200
 42 Lesle Kerstin: 408–456–123 4: 4 Harvard Square, Boston, MA 02133: 
+4/22/62: 52600
 43 JonDeLoach: 408–253–3 122: 12 3 Park St. , San Jose, CA 94086: 7/2
+5/53: 85100
 44 Ephram Hardy:293–259–5395: 2 3 5 Carlton Lane, Joliet, IL 73858: 8
+/12/20: 56700
 45 etty Boop: 245–836–83 57: 63 5 Cutesy Lane, Hollywood, CA 91464: 6
+/23/23: 14500
 46 Wilhelm Kopf:846–836–2837 : 693 7 Ware Road, Milton, PA 93756: 9/2
+1/46: 43500
 47 Norma Corder:397–857 –2735: 74 Pine Street, Dearborn, MI 23874: 3/
+28/45: 245700
 48 James Ikeda: 834–938–8376: 2 3 445 Aster Ave. , Allentown, NJ 8374
+5: 12/1/38: 45000 
 49 Lori Gortz: 327–832–5728: 3 465 Mirlo Street, Peabody, MA 34756: 1
+0/2/65: 35200
 50 Barbara Kerz:385–573 –8326: 83 2 Ponce Drive, Gary, IN 83756: 12/1
+5/46: 268500
[download]

Please assist why I am not getting result, even tough syntax is ok. Thanks!!

Comment on regex issue Download Code

Replies are listed 'Best First'.
Re: regex issue by d5e5 (Beadle) on Nov 10, 2010 at 21:07 UTC
^ in a regex pattern means 'starts with'. No line starts with Lesle. /43500$/ is incomplete. You have to say match it with $inp. Try this: #!/usr/bin/perl use strict; use warnings; while(my $inp = <DATA>){ if ($inp =~ /Lesle/ .. $inp =~ /43500$/){ print "$inp\n"; } } __DATA__ 41 Tommy Savage:408–724–0140: 12 2 2 Oxbow Court, Sunnyvale, CA 94087 +: 5/19/66: 34200 42 Lesle Kerstin: 408–456–123 4: 4 Harvard Square, Boston, MA 02133: +4/22/62: 52600 43 JonDeLoach: 408–253–3 122: 12 3 Park St. , San Jose, CA 94086: 7/2 +5/53: 85100 44 Ephram Hardy:293–259–5395: 2 3 5 Carlton Lane, Joliet, IL 73858: 8 +/12/20: 56700 45 etty Boop: 245–836–83 57: 63 5 Cutesy Lane, Hollywood, CA 91464: 6 +/23/23: 14500 46 Wilhelm Kopf:846–836–2837 : 693 7 Ware Road, Milton, PA 93756: 9/2 +1/46: 43500 47 Norma Corder:397–857 –2735: 74 Pine Street, Dearborn, MI 23874: 3/ +28/45: 245700 48 James Ikeda: 834–938–8376: 2 3 445 Aster Ave. , Allentown, NJ 8374 +5: 12/1/38: 45000 49 Lori Gortz: 327–832–5728: 3 465 Mirlo Street, Peabody, MA 34756: 1 +0/2/65: 35200 50 Barbara Kerz:385–573 –8326: 83 2 Ponce Drive, Gary, IN 83756: 12/1 +5/46: 268500 [download]	[reply] [d/l]
Re: regex issue by Roy Johnson (Monsignor) on Nov 10, 2010 at 20:44 UTC
You want ".." instead of "&&". Caution: Contents may have been coded under pressure.	[reply]
Re^2: regex issue by 7stud (Deacon) on Nov 10, 2010 at 20:48 UTC
...also none of your data even begins with a letter.	[reply]
Re: regex issue by 7stud (Deacon) on Nov 10, 2010 at 20:39 UTC
How would your write the condition: if x is greater than 10 and less than 20 print "hello"?	[reply]
Re: regex issue by aquarium (Curate) on Nov 10, 2010 at 23:48 UTC
untested `while(my $inp = <DATA>) { print "$inp\n" if($. >1 && $. <7); }` [download] the hardest line to type correctly is: stty erase ^H	[reply] [d/l]
Re^2: regex issue by 7stud (Deacon) on Nov 11, 2010 at 00:16 UTC
...or more legibly `use strict; use warnings; use IO::Handle; my $current_line_num; while (my $line = <DATA>) { $current_line_num = DATA->input_line_number(); if( $current_line_num >= 2 and $current_line_num <= 7) { print $line; } }` [download] And if the file is only 100 or so lines long, how about an array slice? `for ( (<DATA>)[1..6] ) { print; }` [download]	[reply] [d/l] [select]
Re^3: regex issue by johngg (Canon) on Nov 11, 2010 at 11:51 UTC
...or more legibly I think you might be obscuring the wood with a lot of trees there! Perhaps use of the `-n` switch would be applicable here, either in a script or as a one-liner. `$ cat rubbish Line1 Line2 Line3 Line4 Line5 Line6 Line7 Line8 Line9 Line10 Line11 Line12 $ perl -ne 'print if 2 .. 7;' rubbish Line2 Line3 Line4 Line5 Line6 Line7 $` [download] The array slice method is, as you say, only suitable for small files whereas using `-n` when combined with last is more efficient when interested only in lines at the beginning of large files. The following examples were acting on a 2,000,000+ line log file. `# time perl -ne 'print if 5 .. 10' maillog Nov 11 04:19:28 ... Nov 11 04:19:28 ... Nov 11 04:19:28 ... Nov 11 04:19:28 ... Nov 11 04:19:28 ... real 0m1.206s user 0m0.773s sys 0m0.432s # time perl -ne 'print if 5 .. 10; last if $. > 10' maillog Nov 11 04:19:28 ... Nov 11 04:19:28 ... Nov 11 04:19:28 ... Nov 11 04:19:28 ... Nov 11 04:19:28 ... real 0m0.013s user 0m0.006s sys 0m0.008s #` [download] I hope this is of interest. Cheers, JohnGG	[reply] [d/l] [select]
Re^2: regex issue by pinnacle (Acolyte) on Nov 10, 2010 at 23:51 UTC
It works!! thanks	[reply]


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