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Perl Error Use Of Uninitialized Value In Pattern Match

is this important? does it mean that if $_[11] is blank, i get this error???? Test::Deep array_each re Test::Deep is a great module if you need to test deep and/or fuzzy data structures, but sometimes it does not give the correct error messages. It's quick & easy. Source

Re: Use of uninitialized value in pattern match (m//) by AnomalousMonk (Canon) on May 23, 2012 at 22:37UTC The regex /^\s*$/ matches by default against the $_ scalar, which is nowhere Perhaps $str =~ /^\*$/ was what you meant? [reply][d/l][select] Re: Use of uninitialized value in pattern match (m//) by tobyink (Abbot) on May 23, 2012 at 22:38UTC It's the elsif condition Marvelous Managed Hosting and Bandwidth Generously Provided by pair Networks Built with the Perl programming language. If you'd like to contribute content, let us know. http://stackoverflow.com/questions/9493304/use-of-uninitialized-value-in-pattern-match-m

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418,617 Members | 1,128 Online Join Now login Ask Question but none refer to pattern matching. I have two questions - is there a more compact way to strip off the process names?

Unfortunately the warning did not say what really caused it, but after patching the Test::Deep::Regexp I could solve the riddle. Yet I still get the uninitialised error? –kurotsuki Feb 29 '12 at 4:05 Just another note, I initialised $page and $element with default blank values, i.e. "" –kurotsuki Feb Unknown warnings category Symbolic references in Perl Can't locate ... on unblessed reference Argument ...

Password Programming This forum is for all programming questions. Assigning the slice to a value, as is 'my $sliced_arry = $arry[1]; print $sliced_arry , does not work either. Let's go back to the actual warning I wanted to explain. Usually looks like this as the first line of your script: #!/usr/bin/perl -w There are certain differences, but as use warnings is available for 12 years now, there is no reason

I get paranoid and end up escaping everything in my regex that is not an Alphanumeric just in case :-) ___ /\__\ "What is the world coming to?" \/__/ www.wolispace.com [download] I like to torture myself 0. if ($page =~ /$pattern/) { push(@array, $element); } But when I run my code it gives me the below error, and continues to run successfully: Use of uninitialized value in pattern In this case you'd better fix the submit form instead. -- Gunnar Hjalmarsson Email: http://www.gunnar.cc/cgi-bin/contact.pl Jul 19 '05 #2 This discussion thread is closed Start new discussion Replies have been disabled

undef uninitialized value $| warnings buffering Prev Next This is one of the most common warning you will encounter while running Perl code. Thankyou! –kurotsuki Feb 29 '12 at 22:16 You're welcome! –ruakh Feb 29 '12 at 22:30 add a comment| up vote 1 down vote The problem isn't $pattern - the Not the answer you're looking for? more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed

You should look for the places where the variable got the last assignment, or you should try to understand why that piece of code has never been executed. this contact form Muskrat (Canon) on Feb 10, 2004 at 03:14UTC Did you give $tmp2 a value? So I had sub descend { my $self = shift; my $got = shift; return 0 if not defined $got; ... Why does a full moon seem uniformly bright from earth, shouldn't it be dimmer at the "border"?

Browse more Perl Questions on Bytes Question stats viewed: 14054 replies: 1 date asked: Jul 19 '05 Follow this discussion BYTES.COM 2016 Formerly "TheScripts.com" from 2005-2008 About Bytes | Advertise For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. In any case this little change helped me figuring out the source of the warnings. have a peek here Use of uninitialized value in pattern match (m//) at submitReport.pl line 34.

Turning off buffering In order to avoid this you can turn off the buffering of STDOUT. sub isUndefOrWhitespace { my $str = ''; $str = shift; print "$str\n"; if (!defined $str) { return 0; }elsif (/^\s*$/) { return 0; } return 1; } [download] Comment on Use How many different varieties (color, size, etc) of socks do you have in your sock drawer? 1.

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The source code of Test/Deep/Regexp.pm looked like this: sub descend { my $self = shift; my $got = shift; my $re = $self->{val}; if (my $match_exp = $self->{matches}) { my $flags email => re('^.*$'), address => re('^.*$') }); with about 25 fields, each one with its own regex. Note that you don't have to escape single-quotes within a regex. Not paying attention I used my $x inside the if block, which meant I have created another $x variable, assigned 42 to it just to let it go out of the

this makes sense. Click Here to receive this Complete Guide absolutely free. I did't get any clue.Can someone please help me on this. #!/usr/bin/perl use warnings; use strict; use CGI qw( :standard ); print redirect( "http://localhost/cgi-bin/auto/submitReport.html") unless para m( "name" ); my $visitor_name Check This Out Are you new to LinuxQuestions.org?

It is there only to make this example a bit more realistic.) There are of course cases when I need to declare a variable inside an if block, but not always. I have managed to make this mistake several times. Are you sure that @_ always has at least 12 elements? ~ishnid; Have you tried: [ search.cpan.org | perldoc | Java API | mysql.com | google ] Apostrophes are NOT used The time now is 09:54 PM.

A quick glance at the return value gave me the impression that this would indicate the success or failure of the regex. Should I be definding a var and using that in my regex? Bangalore to Tiruvannamalai : Even, asphalt road How to add non-latin entries in hosts file Has the acronym DNA ever been widely understood to stand for deoxyribose nucleic acid? In multi-line constructs the line number reported is sometimes several lines away from where a human being would judge the error to have occurred.) When you use a pattern match (like

the CSV file that comes to me from the client has the 12 element (last element in the file) as " " sometimes. He likes to write automated tests and refactor code. Do you have time while you commute to work or back home? The older way is adding a -w flag on the sh-bang line.

So while the word 'OK' is waiting for the buffer to be flushed, the warning message already arrives to the screen. By default Perl buffers STDOUT, the standard output channel, while it does not buffer STDERR, the standard error channel. Similar topics uninitialized string : Pattern Match Pattern Matcher Again uninitialized value in concatenation function to strip out matching value? print $2, "\n"; $string =~ /(\d)(\d)/; # This match fails.

Register Lost Password? So to fix this would the 'best' solution to wrap my code in an if block: if($tmp2){ if($tmp2 =~ m/'/){ ... [download] I thought 'in pattern match' literally meant within the In other words, even though you gave the possibility for $2 to gain a new value in the second match, it retained the original value because the second match failed. Seekers of Perl Wisdom Cool Uses for Perl Meditations PerlMonks Discussion Categorized Q&A Tutorials Obfuscated Code Perl Poetry Perl News about Information?

Please visit this page to clear all LQ-related cookies. join The year of 19100 Scalar and List context in Perl, the size of an array Reading from a file in scalar and list context STDIN in scalar and list context