Of note is that Perl in particular already has safeguards in place to prevent exponential catastrophes. At least for some large class of pathological patterns, it won’t match them very quickly, but neither will it explode in nearly the same way as more naïve engines. The downside is that the required bookkeeping imposes a performance hit on all matching, which makes Perl’s engine slower than that of languages with more naïve engines, like Java. tilly wrote a great, long article on this subject some time ago.
Makeshifts last the longest.
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
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>
-
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).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|