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Top Forums Shell Programming and Scripting Using sed to delete string between delimiters Post 302145366 by Klashxx on Wednesday 14th of November 2007 03:23:50 AM
Old 11-14-2007
Quote:
Originally Posted by [CODE
|[^|]*: [/CODE] matches text starting with | and ending with colon :
One slight clarification, the point here is the use of the regex:
Code:
[^|]

Lets see an example:
Code:
> echo 'P1|10,9:12/123456789|,10:1|11,10:60|15,9:5/12345|,10:1|'|sed -e "s_|.*:_|_g"
P1|1|

|.*: matchs any character (starting with | and ending with : ) and the result is not what we expect.
Code:
 echo 'P1|10,9:12/123456789|,10:1|11,10:60|15,9:5/12345|,10:1|'|sed -e "s_|*:_|_g"    
P1|10,9|12/123456789|,10|1|11,10|60|15,9|5/12345|,10|1|

|*: nothing happens here because we are looking for any number (including zero) of the single character | that immediately precedes the asterisk.

So the trick to solve the problem is match any number of any character between | and : except | and that's what we are getting with |[^|]*:

Regards
 

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Digest::CRC(3)						User Contributed Perl Documentation					    Digest::CRC(3)

NAME
Digest::CRC - Generic CRC functions SYNOPSIS
# Functional style use Digest::CRC qw(crc64 crc32 crc16 crcccitt crc crc8 crcopenpgparmor); $crc = crc64("123456789"); $crc = crc32("123456789"); $crc = crc16("123456789"); $crc = crcccitt("123456789"); $crc = crc8("123456789"); $crc = crcopenpgparmor("123456789"); $crc = crc($input,$width,$init,$xorout,$refout,$poly,$refin,$cont); # add data to existing $crc = crc32("ABCD", $crc); # OO style use Digest::CRC; $ctx = Digest::CRC->new(type=>"crc16"); $ctx = Digest::CRC->new(width=>16, init=>0x2345, xorout=>0x0000, refout=>1, poly=>0x8005, refin=>1, cont=>1); $ctx->add($data); $ctx->addfile(*FILE); $digest = $ctx->digest; $digest = $ctx->hexdigest; $digest = $ctx->b64digest; DESCRIPTION
The Digest::CRC module calculates CRC sums of all sorts. It contains wrapper functions with the correct parameters for CRC-CCITT, CRC-16, CRC-32 and CRC-64, as well as the CRC used in OpenPGP's ASCII-armored checksum. SEE ALSO
https://tools.ietf.org/html/rfc4880#section-6 AUTHOR
Oliver Maul, oli@42.nu COPYRIGHT
CRC algorithm code taken from "A PAINLESS GUIDE TO CRC ERROR DETECTION ALGORITHMS". The author of this package disclaims all copyrights and releases it into the public domain. perl v5.16.2 2013-08-25 Digest::CRC(3)
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