For example: "--eeeeeeeeeee1" would be accepted as a number when it's definitely not (although perl could evaluate that string in numeric context giving it a value of 1).
Eh, no. "--eeeeeeeeeee1" in numerical context is 0. When casting a string to a numeric value, Perl will always look at the beginning of a string. Something that starts with "--" cannot be a number; hence, it'll get the value 0. 
$ perl -wE 'say 0 + "--eeeeeeeeeee1"'
Argument "--eeeeeeeeeee1" isn't numeric in addition (+) at -e line 1.
0
$

[download]

In reply to Re^4: Extraction number from Text by JavaFan
in thread Extraction number from Text by Anonymous Monk

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.