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POPERL -- Regex incl all hash keys (sorted) + deleting empty fields from $_ in file read
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  1. POPERL -- Regex incl all hash keys (sorted) + deleting empty fields from $_ in file read
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    copied!<p>I'm working on a program and I have a couple of questions, hope you can help:</p> <p>First I need to access a file and retrieve specific information according to an index that is obtained from a previous step, in which the indexes to retrieve are found and store in a hash.</p> <p>I've been looking for a way to include all array elements in a regex that I can use in the file search, but I haven´t been able to make it work. Eventually i've found a way that works:</p> <pre><code>my @atoms = (); my $natoms=0; foreach my $atomi (keys %{$atome}){ push (@atoms,$atomi); $natoms++; } @atoms = sort {$b cmp $a} @atoms; </code></pre> <p>and then I use it as a regex this way:</p> <pre><code>while (&lt;IN_LIG&gt;){ if (!$natoms) {last;} ...... if ($_ =~ m/^\s*$atoms[$natoms-1]\s+/){ $natoms--; ..... } </code></pre> <p>Is there any way to create a regex expression that would include all hash keys? They are numeric and must be sorted. The keys refer to the line index in IN_LIG, whose content is something like this: </p> <pre><code>8 C5 9.9153 2.3814 -8.6988 C.ar 1 MLK -0.1500 </code></pre> <p>The key is to be found in column 0 (8). I have added ^ and \s+ to make sure it refers only to the first column.</p> <p>My second problem is that sometimes input files are not always identical and they make contain white spaces before the index, so when I create an array from $_ I get column0 = " " instead of column0=8</p> <p>I don't understand why this "empty column" is not eliminated on the split command and I'm having some trouble to remove it. This is what I have done:</p> <pre><code>@info = split (/[\s]+/,$_); if ($info[0] eq " ") {splice (@info, 0,1);} # also tried $info[0] =~ m/\s+/ </code></pre> <p>and when I print the array @info I get this:</p> <pre><code>Array: Array: 8 Array: C5 Array: 9.9153 Array: 2.3814 ..... </code></pre> <p>How can I get rid of the empty column?</p> <p>Many thanks for your help Merche</p>
 

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