That is actually the usual behavior. The regex is usually implemented as a DFA ( Finite State Machine), and occasionally they have to backtrack to complete the match. Your code is executed at the time the DFA moves through your (?{}) block even if it doesn't make it to the end which is when the DFA "matches."
In this case, it is your lookbehind that's causing the DFA to remember something, wander forward to see if it's relevant, and wander back when it isn't... If you put your (?{}) block at the very end it would only print when it actually finds a match.
-
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.
|
