Something like:
use strict;
use warnings;
my $file = <<FILE;
----------------------------
! Optimized Parameters !
! (Angstroms and Degrees) !
---------------------- -------------------
+-----------------------------------------------------
! Name Value Derivative information (Atomic Units)
+ !
---------------------------------------------------------------------
+---
! hc2 1.1136 -DE/DX = 0.0
+ !
! nc3 1.3392 -DE/DX = 0.0
+ !
! nch3 117.4979 -DE/DX = 0.0
+ !
! hn4 0.9929 -DE/DX = 0.0
+ !
----------------------------------------------------------------------
+--
GradGradGradGradGradGradGradGradGradGradGradGradGradGradGradGradGradGr
+adGrad
FILE
open my $inFile, '<', \$file;
my $valueStart;
my $valueLength;
my $min = 1.0;
my $max = 2.0;
while (<$inFile>) {
next unless m/Optimized Parameters/ .. m/GradGradGrad/;
next unless $valueLength or /^(.*?Name)(\s*Value)/;
if (! $valueLength) {
$valueStart = length $1;
$valueLength = length $2;
next;
}
my $value = substr $_, $valueStart, $valueLength;
next unless $value =~ /^\s*[+-]?\d+(\.\d*)?\s*$/;
next if $value < $min or $value > $max;
print $_;
}
close $inFile;
Prints:
! hc2 1.1136 -DE/DX = 0.0
+ !
! nc3 1.3392 -DE/DX = 0.0
+ !
Perl is environmentally friendly - it saves trees
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