You are mistaken!

This

is only printing the part before the first "TOPO_DOM" which is an empty string ""

"TOPO_DOM 1 ...
^^

[download]

You have to inspect the full array

Debugger-Demo

> perl -de0
...
  DB<21> $string="TOPO_DOM 1; /note=Cytoplasmic; /evidence=ECO:0000269
+|PubMed:24744376; TOPO_DOM 25..74; /note=Extracellular;..."

  DB<22> x split /TOPO_DOM/, $string
0  ''
1  ' 1; /note=Cytoplasmic; /evidence=ECO:0000269|PubMed:24744376; '
2  ' 25..74; /note=Extracellular;...'
  DB<23>

[download]

Cheers Rolf
(addicted to the 𐍀𐌴𐍂𐌻 Programming Language :)
Wikisyntax for the Monastery

In reply to Re: Why is this split not doing anything? by LanX
in thread Why is this split not doing anythine? 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.