I agree with kwaping, I would use tr/// for this solution. 
#!/usr/bin/perl -w
use strict;

while (<DATA>) {
    chomp;
    tr/[]//d;
    $_ = join(" ",split " ", $_);
    print "$_\n";
}

__DATA__
[
 [ 0.039543323]
 [ 0.068993981]
 [ 0.086558227]
 [  0.12252527]
 [  0.14724698]
 [  0.16631099]
 [  0.18877556]
 [  0.20234162]
 [  0.18110326]
 [  0.13155017]
[  -4.0316574]
 [  -3.6178487]
 [  -3.1186917]
]

[download]

In reply to Re^3: removing square brackets by softworkz
in thread removing square brackets by Angharad

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.