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Top Forums UNIX for Beginners Questions & Answers Using forward slash in search pattern in perl script Post 302975508 by bakunin on Tuesday 14th of June 2016 01:37:02 PM
Old 06-14-2016
Quote:
Originally Posted by ambarginni
and I wanted to include below keywords in my search pattern
Code:
 "I/O exception" and "FileNotFoundException"

It is relatively easy: the forward slash has a special meaning. Whenever you want to use a character with a special meaning literally you need to "escape" it. Escaping is done by prepending it with a backslash:

Code:
my $pattern = "^Line.*?:|^Errors*: [^0]|[...]|I\/O exception";

Notice that "|" separates different patterns to seach for and is like a logical OR. The expression

Code:
"ab|cd|ef|gh"

searches for any occurrence of "ab" or "cd" or "ef" or "gh". Therefore to add a pattern just add a "|" at the end and then the pattern you intend to search for.

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
 

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SVK::Log::Filter::Grep(3)				User Contributed Perl Documentation				 SVK::Log::Filter::Grep(3)

SYNOPSIS
SVK::Log::Filter::Grep - search log messages for a given pattern DESCRIPTION
The Grep filter requires a single Perl pattern (regular expression) as its argument. The pattern is then applied to the svn:log property of each revision it receives. If the pattern matches, the revision is allowed to continue down the pipeline. If the pattern fails to match, the pipeline immediately skips to the next revision. The pattern is applied with the /i modifier (case insensitivity). If you want case-sensitivity or other modifications to the behavior of your pattern, you must use the "(?imsx-imsx)" extended pattern (see "perldoc perlre" for details). For example, to search for log messages that match exactly the characters "foo" you might use svk log --filter "grep (?-i)foo" However, to search for "foo" without regards for case, one might try svk log --filter "grep foo" The result of any capturing parentheses inside the pattern are not available. If demand dictates, the Grep filter could be modified to place the captured value somewhere in the stash for other filters to access. If the pattern contains a pipe character ('|'), it must be escaped by preceding it with a '' character. Otherwise, the portion of the pattern after the pipe character is interpreted as the name of a log filter. STASH
/PROPERTY MODIFICATIONS Grep leaves all properties and the stash intact. perl v5.10.0 2008-08-04 SVK::Log::Filter::Grep(3)
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