Hello sabas
To answer your questions.
- yes
- In Perl, these metacharacters need to be escaped if they are to be matched literally \ | ( ) [ { ^ $ * + ? . (also called the dirty dozen) By using \Q ... \E, you escape any possible metacharacters in the variable being used for the regular expression - in this case $_
- He is compiling the regular expression $search_expression From Regexp Quote Like Operators the reason is Precompilation of the pattern into an internal representation at the moment of qr() avoids the need to recompile the pattern every time a match /$pat/ is attempted So, this avoids compiling the regular expression each time it is encountered in the while loop below next unless m/$search_expression/;
- Go to the top of the while loop and get the next line unless the regular expression matches this line. This skips the lines of code below if true.
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
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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>
<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).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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