if ($comment1 =~ " ") { # reads: if comment1 *HAS* a space
  ...
}
if ($comment1 !~ " ") { # reads: if comment1 *DOESN'T HAVE* a space
  ...
}
if ($comment1 eq " ") { # reads: if comment1 *IS* a space
  ...
}
if ($comment1 ne " ") { # reads: if comment1 *IS NOT* a space
  ...
}
if ($comment1 == " ") { # reads: if comment1 *Numerically Equals* a sp
+ace
                        # since space == 0, 
                        # ==> same as 
                        # if($comment1 == 0){ ... }
  ...
}
if ($comment1 != " ") { # reads: *Numerical* not equal to... 
  ...
}

[download]
Hope this helps,,,

PS: As Marza suggested, the llama book is a good book.

Update: Added the other cases.

In reply to Re: Re: Re: Help ! New in perl and cgi by abstracts
in thread Help ! New in perl and cgi by britney

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.