by throwing away whitespace characters from the end of string first, then whitespace characters from the beginning of the string, then any characters from the end of the string.

Your code removes from the beginning first. It doesn't produce the result in the table you posted.

A regex solution: 

s/^(.{6,}?)\s+\z/$1/s;
s/^\s*(.{6}).*\z/$1/s;

[download]

Possibly faster alts for first line: 

s/(?<=.{6})\s+\z//s;

[download]
s/.{6}\K\s+\z//s;     # Req 5.10

[download]

Possibly faster alts for second line: 

s/^\s+(?=.{6})//s;
s/(?<=^.{6}).*\z//s;

[download]
s/^\s+(?=.{6})//s;
s/(?<=.{6}).*\z//s;

[download]
s/^\s+(?=.{6})//s;
s/^.{6}\K.*\z//s;     # Req 5.10

[download]

In reply to Re: Truncate string to limited length, throwing away unimportant characters first. by ikegami
in thread Truncate string to limited length, throwing away unimportant characters first. by ambrus

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.