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    <p>Quotemeta is safe under these assumptions:</p> <ol> <li>Only non-alphanumeric characters have a special meaning.</li> <li>If a non-alphanumeric character has a special meaning, putting a backslash in front of it will always make it non-special.</li> <li>If a non-alphanumeric character doesn't have a special meaning, putting a backslash in front of it will do nothing.</li> </ol> <p>The shell violates rules 2 and 3 no matter what quote context you use -- outside of quotes, backslash-newline doesn't generate newline; in double-quotes, backslash-punctuation puts a backslash into the output (outside of a certain list of punctuation); and in single-quotes, everything is literal and backslash doesn't even protect you against a closing single-quote.</p> <p>I still recommend <code>String::ShellQuote</code> if you need to quote things for the shell. I also recommend avoiding letting the shell process your filenames entirely, if you can, by using <code>LIST</code>-form <code>system</code>/<code>exec</code>/<code>open</code> or <a href="http://search.cpan.org/perldoc/IPC::Open2" rel="noreferrer">IPC::Open2</a>, <a href="http://search.cpan.org/perldoc/IPC::Open3" rel="noreferrer">IPC::Open3</a>, or <a href="http://search.cpan.org/perldoc/IPC::System::Simple" rel="noreferrer">IPC::System::Simple</a>.</p> <p>As for things besides the shell... lots of different things violate one or more of the rules. For example, obsolete POSIX "basic" regexes and various kinds of editor regexes have punctuation characters that are non-special by default, but <em>become special</em> when preceded by backslash. Basically what I'm saying is, know the thing that you're feeding your data to very well, and escape properly. Only use <code>quotemeta</code> if it's an exact fit, or if you're using it for something that's not very important.</p>
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    1. POPerl: Is quotemeta for regular expressions only? Is it safe for file names?
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    1. CO+1: Thanks. I use `String::ShellQuote` mostly because I understand how it works.
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