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Posted by yawnmoth on 02/07/07 21:24
On Feb 7, 2:50 am, Curtis <dyers...@verizon.net> wrote:
> On Mon, 05 Feb 2007 11:24:30 -0800,yawnmoth<terra1...@yahoo.com> wrote:
> > Say I have the following script:
>
> > <?php
> > $contents = file_get_contents('preg_test.txt');
> > echo preg_match("#(.*?)[\r\n]+ddddddddddddd#s",$contents) ? 'is
> > equal' : 'is not equal';
> > ?>
>
> > Here's preg_test.txt:
>
> >http://www.geocities.com/terra1024/preg_test.txt
>
> > (it's a malformed part of a postscript file, in case you're curious)
>
> > My question is... when I remove the s modifier, preg_match returns
> > true. When the s modifier is there, it returns false. I'm not really
> > sure why this is. The s modifier means that . includes new lines and
> > carriage returns. In either case, it seems like it should match.
>
> > Any ideas as to why it doesn't?
>
> This is a very inefficient regex for a large amount of data. Since you are
> using the lazy asterisk with the dot, the regex engine immediately starts
> backtracking throughout the search. It would be easier to specify the
> amount of d's through the {} quantifier, not hardcoding.
>
> Is there a reason you capture all the content before the CRLF and d
> portion of the pattern? It looks like you're merely testing if any
> whitespace and 13 d's exist. If that's the case, you could just use the
> strstr() function. If you want everything except the whitespace and d's,
> then use substr().
I'm trying to extract fonts from *.ps files. Because the fonts can
have any name of any length (afaik), substr() isn't sufficient. That
said, I assume [^\r\n]+ would be more efficient than .*? ?
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