Re: String Search/Replace

How about a regex:

#!c:\perl\bin\perl.exe -w

use strict;
use warnings;

for my $line (<DATA>)
{
    $line =~ s/ \d{4,}( |$)/ 0$1/g;
    print $line;
}

__DATA__
1125356700 0 0 0 0
1125356400 15 0 25 0
1125356100 25 0 25 0
1125355800 25 0 25 0
1125355500 25 0 25 0
1125397800 0 0 0 0
1125397500 0 0 0 0
1125397200 0 0 0 0
1125396900 0 0 0 0
1125396600 0 0 0 0
1125396300 0 0 0 0
1125396000 39006 0 63597 0
1125395700 63597 0 63597 0
1125395400 63597 0 63597 0
1125395100 63597 0 63597 0
1125394800 63597 0 63597 0
1125394500 63597 0 63597 0
1125394200 63597 0 63597 0
[download]

Or for a one liner:

perl.exe -ple "s/ \d{4,}( |$)/ 0$1/g" filename
[download]

Update:

Oops... As cheseter has pointed out, the above will replace 1000 when it should not.

Here's my regex that works:

$line =~ s/ (\d+)/$1>1000?" 0":" $1"/ge;
[download]

or at least I think it does.

Comment on Re: String Search/Replace Select or Download Code

Replies are listed 'Best First'.
Re^2: String Search/Replace by ikegami (Patriarch) on Aug 31, 2005 at 15:33 UTC
`{4,}` is greedy, so the `( \|$)` is not needed. The following is sufficient, shorter and faster: `perl -ple "s/ \d{4,}/ 0/g" infile >outfile` [download]	[reply] [d/l] [select]
Re^3: String Search/Replace by ChrisR (Hermit) on Aug 31, 2005 at 15:49 UTC
Thanks. I didn't think about that. I've never been very good at golf (perl or otherwise).	[reply]
Re^3: String Search/Replace by Roy Johnson (Monsignor) on Aug 31, 2005 at 16:10 UTC
The `-l` is unnecessary, too. Caution: Contents may have been coded under pressure.	[reply] [d/l]
Re^2: String Search/Replace by chester (Hermit) on Aug 31, 2005 at 16:03 UTC
Actually doesn't the original question say to replace numbers "over 1000" with 0? Your solution also replaces 1000 with 0, which would be incorrect.	[reply]
Re^3: String Search/Replace by ChrisR (Hermit) on Aug 31, 2005 at 17:50 UTC
Err... You've got me there. I think you should remove the `strike` from your previous post. Your solution is the shortest since it appears that mine is incorrect.	[reply] [d/l]
Re^2: String Search/Replace by gargle (Chaplain) on Aug 31, 2005 at 18:38 UTC
Hi, I really do love regex's but sometimes, when only used to cut up a string in pieces, pieces seperated by the same character, I prefer to use split. Reading the code becomes a bit easier on the eyes because you can immediately deduct the meaning of the line of code. With regex's you still have to do a bit of mental juggling before the intention becomes clear. -- if ( 1 ) { $postman->ring() for (1..2); }	[reply]