In your second example you have to escape the @ because the string in double quotes gets interpolated. But if you use the variable later, for example with $n= $emailaddress . 'xyz'; or $n= "this is $emailaddress";, no such interpolation takes place in the variable. Naturally in the second example the literal string is interpolated, but not the contents of $emailaddress

So basically, if your first example works then an unescaped email address read from file will work too

There are situations where escaping is still necessary, in these cases you can use quotemeta() or a regular expression if only specific characters are to be escaped

In reply to Re: Simple problem with @ in string. by jethro
in thread Simple problem with @ in string. by bcens

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.