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Full Discussion: AIX 4.2 Korn shell and grep question
Operating Systems AIX AIX 4.2 Korn shell and grep question Post 302255461 by bakunin on Thursday 6th of November 2008 12:41:07 PM
Old 11-06-2008
Quote:
Originally Posted by Browser_ice
to my understanding, the amount of comma separated fields are constant but do not have to have data in them so they can be empty. Is it possible to do a grep search according to n-number of fields (comma separated) with some of those fields having specific values ?
Yes, there is. We'll go through that one step at a time:

when the fields are comma-separated, then a single field would be: some (optional, the field could be empty) character(s) followed by a comma. A regular expression covering this would be:

Code:
[^,]*,

This regex would find any number of non-commas followed by a comma, in other words, one field. Lets assume now that you want to search for a specific content of the 18th field. You would have to look for 17 repetitions of this pattern followed by some value. Fortunately there is a "multiplicator" device for such occasions in regex:

Code:
\([^,]*,\)\{17\}search,

This would search for 17 repetitions of "[^,]*," (the "\(" and "\)" are grouping characters, the "\{...\}" is said repetition counter - sort-of "parameterized asterisk"), followed by "search" as the text to search for in the 18th field.

You should no be able to construct your own regexp, based on this.

I hope this helps.

bakunin
 

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LEARN ABOUT DEBIAN

jifty::action::record::search

Jifty::Action::Record::Search(3pm)			User Contributed Perl Documentation			Jifty::Action::Record::Search(3pm)

NAME

       Jifty::Action::Record::Search - Automagic search action

DESCRIPTION

       The class is a base class for Jifty::Actions that serve to provide an interface to general searches through Jifty::Record objects. To use
       it, subclass it and override the "record_class" method to return the fully qualified name of the model to do searches over.

METHODS

   arguments
       Remove validators from arguments, as well as ``mandatory'' restrictions. Remove any arguments that render as password fields, or refer to
       collections.

       Generate additional search arguments for each field based on the following criteria:

       "text", "char" or "varchar" fields
	   Create "field"_contains and "field"_lacks arguments

       "date", or "timestamp" fields
	   Create "field"_before, "field"_after, "field"_since and "field"_until arguments.

       "integer", "float", "double", "decimal" or "numeric" fields
	   Generate "field"_lt, "field"_gt, "field"_le and "field"_ge arguments, as well as a "field"_dwim field that accepts a prefixed
	   comparison operator in the search value, such as ">100" and "!100".

   take_action
       Return a collection with the result of the search specified by the given arguments.

       We interpret a "undef" argument as SQL "NULL", and ignore empty or non-present arguments.

SEE ALSO

       Jifty::Action::Record, Jifty::Collection

LICENSE

       Jifty is Copyright 2005-2010 Best Practical Solutions, LLC.  Jifty is distributed under the same terms as Perl itself.

perl v5.14.2							    2010-12-10					Jifty::Action::Record::Search(3pm)
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