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Full Discussion: ksh pattern matching
Top Forums Shell Programming and Scripting ksh pattern matching Post 302166001 by ripat on Sunday 10th of February 2008 12:00:17 PM
Old 02-10-2008
Quote:
Originally Posted by drl
The "Patterns and Regular Expression" syntax uses:
Code:
*(exp), ?(exp), !(exp) ...

(...) These patterns could be used within double brackets, for example (...) but not with string operator syntax (as far as I know) -- page 113 ff, 144 ff.
They do partially work in my ksh version (1993-12-28 r):

Code:
var='jo mike and dave are good friends'

$ echo ${var//a?(re)/_}
# returns > jo mike _nd d_ve _ good friends

$ echo ${var//g*(o)/_}
#returns > jo mike and dave are _d friends

$ echo ${var//+(o)/_}
#returns > j_ mike and dave are g_d friends

$ echo ${var//@(jo|dave)/_}
#returns > _ mike and _ are good friends

All returns as expected but I try to use the !(exp) like the PCRE look behind assertions (?<=exp). Still trying...
 

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snexpire,v0.3.8(8)					      System Manager's Manual						snexpire,v0.3.8(8)

NAME
snexpire - expire news under the sn system. SYNOPSIS
snexpire [-v] [-exp] newsgroup [[-exp] newsgroup]... DESCRIPTION
snexpire expires news in the sn news system, one article file (=10 articles, compile time default) at a time. snexpire always leaves behind at least one article file, so that newly entered articles will have numbers not overlapping previously used numbers. As an excep- tion if the expiration age is set to 0, then even this last file will be expired and subsequent article numbers will start from the begin- ning. You will need to be root or own /var/spool/sn to run snexpire. OPTIONS
-v Output a line for each article expired. The format of this line is the same as for snscan. ARGUMENTS
snexpire expires all newsgroups named on the command line. Each newsgroup may be preceded by -exp to control the expiration age. exp is of the form #[hdwmy] where # is a number, followed by one of the characters h,d,w,m,y representing hours, days, weeks, months and years. The default for -exp is a compile-time fixed. Each [-exp] applies to the next newsgroup only, any newsgroups after that one get default treatment unless overridden by another [-exp]. FILES MODIFIED
/var/spool/sn/newsgroup/.times, /var/spool/sn/newsgroup/[0123456789]*, /var/spool/sn/{.chain,.table}. ENVIRONMENT VARIABLES
SNROOT If this is set and is not empty, the value is used in place of /var/spool/sn, the default news spool directory. FILES
/var/spool/sn/newsgroup/.expire If this exists, its contents are taken to be exp if not overridden by -exp on the command line. N.B. Harold Tay snexpire,v0.3.8(8)
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