If it's on Linux, looking for the shebang is probably a very good sign. The line might be missing more often on Windows. Then you can look at use directives (things that look like use stuff before any other line (except the shebang) in the file). strict and warnings are pretty sure signs. Cpan modules give a pretty good clue as well. But even something that looks like a valid use statement like use UnknownModuleBecauseIt'sCustom; put the odds in favor of the file being perl.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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