On Tue, 24 Aug 2004 23:53:53 -0700, Daniel Lahey <[EMAIL PROTECTED]> wrote:
> I'm trying to figure out how to formulate a regular expression that
> will get me everything following a pound sign (#) up to the first space
> or { character. (I'm trying to parse the ids out of a style sheet.)
> Can anyone point me in the right direction? I've been searching on the
> web for hours and reading everything I can find on regular expressions,
> but I just can't wrap my brain around it. Thanks.
>
Try this snippet
----
<pre>
<?php
$css = fopen("http://www.csszengarden.com//001/001.css";, "r");
$data = fread($css, 30000);
preg_match_all("/#.+({ )/", $data, $out);
print_r($out);
?>
</pre>
It gets the default css from the zengarden site. (30k is a large
buffer, but this is not a howto on buffered reads)
The regular expression
/#.+({ )/
means, piece by piece
# the # character
. dot is a special character in regular expressions. it can match
any character
+ is also a special character, it means match 1 or more times
so .+ means match any character 1 or more times
( ) are special characters, they match any single character inside them.
in the case of ({ ) , it matches either a space or a left bracket
So, the whole expression means:
match a strings where they start with #, followed by 1 or more
characters, followed by a space or a left-bracket
Note that these are very simplified explanations for regular expressions.
Now, try the expression
/#(.+)({ )/
and instead of print_r($out), try
print_r($out[1]);
Now you get the classnames :) Check out the following sites for more
info (they appear first when you google regular expressions).
http://sitescooper.org/tao_regexps.html
http://etext.lib.virginia.edu/helpsheets/regex.html
Also, check out the PHP manual for the preg_* functions
---
Note that the script i gave you has problems with classnames on one line, like
#footer a:link, #footer a:visited
But I won't spoon feed you :)
----
ramil
http://ramil.sagum.net
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