One starts searching at the beginning of the string and the other does the search in reverse, hence the 'r'
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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>
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<sub> <sup> <table>
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<code> tags not
<pre> tags. In fact, <pre>
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or How to display code and escape characters
are good places to start.