><span class="identifier">alnum</span><span class="special">*</span> <span class="identifier">digit</span>
</pre>
<p>
        In PEG, alnum will eat as much alpha-numeric characters as it can leaving
        nothing more left behind. Thus, the trailing digit will get nothing. Loops
        are simply implemented in recursive descent code as for/while loops making
        them extremely efficient. That is a definite advantage. On the other hand,
        those who are familiar with EBNF and regex behavior mig