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List:       cgi-list
Subject:    RE: [CGI] how do i extract everything between <TABLE> and </TABLE>from a variable?
From:       "Mark.G.Franz" <MARK.G.FRANZ () cpmx ! saic ! com>
Date:       1998-02-26 14:49:05
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Just a comment, this list could use some more teachers, I often see a
answer without a thorough explanation, I find that being able to read
whats happening makes the script understandable.

Mark

> -----Original Message-----
> From:	Jonathan Peterson [SMTP:jon@amxdigital.com]
> Sent:	Thursday, February 26, 1998 1:36 AM
> To:	cgi-list@jann.com
> Subject:	RE: [CGI] how do i extract everything between <TABLE>
> and </TABLE>from a variable?
> 
> At 02:41 PM 2/26/98 +1300, James McNeill wrote:
> >Something like this should work:
> >
> >my ($table) = $a =~ m|<table>(.*?)</table>|si;	
> 
> Since it's not obvious:
> 
> 1. The variable $table needs to be in brackets, so that it is a list
> context. If it is a list context, perl returns the text captured by
> the
> brackets, otherwise it returns the number of matches found.
> 
> 2. .*? is like .* but the ? makes it non-greedy. This basically means
> it
> will matches the shortest valid string. This would be important if
> there
> were multiple table tags in the text.
> 
> 3. There are two modifiers at the end, s and i. i simply makes the
> match
> case insensitive. The s treats the text as a single line, essentially
> ignoring linebreaks. This is needed, because .* doesn't normally match
> linebreaks. If you need to slurp up multiple lines in a regexp, the s
> modifier is very handy.
> 
> Sorry for being such a teacher! (Esp. if I got something wrong...)
> 
> --------
> Jon Peterson	jon@amxdigital.com	+44 (0)171 613 5300
> Internet Developer
> 
> 
> Test tube babies shouldn't throw stones.
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