Subject:
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Re: Regular Expression help?
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Newsgroups:
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lugnet.off-topic.geek
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Date:
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Tue, 8 Jul 2003 19:02:52 GMT
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Viewed:
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369 times
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In lugnet.off-topic.geek, Dan Boger wrote:
> On Tue, Jul 08, 2003 at 06:44:29PM +0000, David Eaton wrote:
> > For *BORDER* tags, you're in luck:
> >
> > /<img(\s+[^bB]\w+=("[^"]"|\S*))*>/i
> ^
> missing "*" here --------/
Woops, yep
> > But that is on the (valid?) presumption that the ONLY attribute for an
> > <img> tag that starts with the letter "B" is "BORDER". I suppose I
> > could be wrong what with all the custom attributes that MSIE has, etc.
> > But if there ARE other attributes that start with B, then the above
> > DOESN'T work, since it'll ignore anything that's got an attribute that
> > starts with B.
>
> wouldn't this also break on this:
>
> <img src="1.jpg" alt="Some Text with Contrived B=something in it">
? Wouldn't it not, since it matches on the double quote first? IE it would match
alt="........." as a single dealy? I'll test....
Ran as a test:
foreach(
'<img src="foo.jpg">',# matches
'<img border="" src="foo.jpg">',# no match
'<img border= src="foo.jpg">',# no match
'<img src="foo.jpg" border="0">',# no match
'<img src="foo.jpg" border=0>',# no match
'<img src="foo.jpg" border="0" height="75">',# no match
'<img src="foo.jpg" border=0 height="75">',# no match
'<img src="foo.jpg" width="50">',# matches
'<img src="1.jpg" alt="Some Text with Contrived B=something in it">',
'<img src="1.jpg" alt="Some Text with Contrived B=something in it" border=1>',
'<img src="1.jpg" alt="Some Text with Contrived B=something in it"
border="1">',
'<img src="1.jpg" border=1 alt="Some Text with Contrived B=something in it">',
'<img src="1.jpg" border="1" alt="Some Text with Contrived B=something in
it">',
) {
if(/<img(\s+[^bB]\w+=(\"[^\"]*\"|\S*))*>/i) {
print "Y - $_\n";
} else {
print "N - $_\n";
}
}
Output:
Y - <img src="foo.jpg">
N - <img border="" src="foo.jpg">
N - <img border= src="foo.jpg">
N - <img src="foo.jpg" border="0">
N - <img src="foo.jpg" border=0>
N - <img src="foo.jpg" border="0" height="75">
N - <img src="foo.jpg" border=0 height="75">
Y - <img src="foo.jpg" width="50">
Y - <img src="1.jpg" alt="Some Text with Contrived B=something in it">
N - <img src="1.jpg" alt="Some Text with Contrived B=something in it" border=1>
N - <img src="1.jpg" alt="Some Text with Contrived B=something in it"
border="1">
N - <img src="1.jpg" border=1 alt="Some Text with Contrived B=something in it">
N - <img src="1.jpg" border="1" alt="Some Text with Contrived B=something in
it">
So, it seems to work... But as admitted, only because "BORDER" is the only thing
starting with a "B"...
DaveE
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Message has 1 Reply:
 | | Re: Regular Expression help?
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| (...) David, Thanks for this additional approach. I thought that I had tried something similar to this, but I must have gotten some portion of it wrong, as I could get no matches in my data. Thanks again, -Andy Lynch (21 years ago, 9-Jul-03, to lugnet.off-topic.geek)
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Message is in Reply To:
| | Re: Regular Expression help?
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| (...) ^ missing "*" here --------/ (...) wouldn't this also break on this: <img src="1.jpg" alt="Some Text with Contrived B=something in it"> :) But other than that, good idea to look at what's valid :) (21 years ago, 8-Jul-03, to lugnet.off-topic.geek)
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