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Shaggy
Support Moderator
Ireland
6780 Posts |
 Posted - 08 April 2008 : 05:46:45
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I've got the following RegExp running at the moment:\[image=(.*?.(gif|jpeg|jpg|png)) align=(left|right) width=(\d+?) height=(\d+?) title=(.*?)\]
<img src="$1" class="$2" width="$3" height="$4" alt="$5" /> And it's working perfectly. The problem I'm facing though, is I need to make all the attributes optional so that if they're not included in the input string or don't have a value or, in the case of "align", the value isn't "left" or "right", the corresponding attribute is not included in the output string, except the "alt" attribute. Thinking about it, I can't see any way this would be possible with a regular expression, unless I created a separate pattern for each possible combination of attributes. Of course, I've been learning recently that advanced regular expressions are still way beyond my understanding! 
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ruirib
Snitz Forums Admin
Portugal
26364 Posts |
Posted - 08 April 2008 : 06:24:18
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| Yeah, I agree with you. If you want different outputs depending on the input, you'd need a different expression for each of the combinations. As an alternative, you'd need need some code to look at the matches and decide accordingly. |
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MarcelG
Retired Support Moderator
Netherlands
2625 Posts |
Posted - 09 April 2008 : 06:00:28
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What I saw on Gathering of Tweakers (dutch tech forum), is that they do it like this (I have no idea how the RegExp behind this works, but this may give you a hint.):
[tagname=value1,value2] content [/tagname]
For example for the IMG tag, they have these values:
[img=width,height,link,align,title,border] url of the image[/img]
Now, to have an image with only the border turned on, you use this:
[img=,,,,,1] url of the image[/img]
To set it's dimensions, and provide a title but not set the border, use this:
[img=640,480,,,Image Title,] url of the image[/img]
It's pretty difficult for normal users to understand this method, but for the more advanced user it can be explained. |
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Edited by - MarcelG on 09 April 2008 06:02:05 |
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HuwR
Forum Admin
United Kingdom
20579 Posts |
Posted - 09 April 2008 : 09:12:48
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how many attributes do you want to allow in your image tag ?
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Shaggy
Support Moderator
Ireland
6780 Posts |
Posted - 09 April 2008 : 09:56:56
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At most, it should only contain the 5 I posted above - image (src) align (class), width, height & title (alt). At least, it needs to contain the image (src) attribute. Here's the version I have at the moment, which allows for all possible combinations:\[image=(\S*?.(gif|jpeg|jpg|png)) align=(left|right) width=(\d+?) height=(\d+?)( title=(.*?)){0,1}\]
<img src="$1" class="$3" width="$4" height="$5"" alt="$7" />
\[image=(\S*?.(gif|jpeg|jpg|png))( title=(.*?)){0,1}\]
<img src="$1" alt="$4" />
\[image=(\S*?.(gif|jpeg|jpg|png)) width=(\d+?) height=(\d+?)( title=(.*?)){0,1}\]
<img src="$1" width="$3" height="$4" alt="$6" />
\[image=(\S*?.(gif|jpeg|jpg|png)) align=(left|right)( title=(.*?)){0,1}\]
<img src="$1" class="$3" alt="$5" />
\[image=(\S*?.(gif|jpeg|jpg|png)) width=(\d+?)( title=(.*?)){0,1}\]
<img src="$1" width="$3" alt="$5" />
\[image=(\S*?.(gif|jpeg|jpg|png)) height=(\d+?)( title=(.*?)){0,1}\]
<img src="$1" height="$3" alt="$5" />
\[image=(\S*?.(gif|jpeg|jpg|png)) align=(left|right) width=(\d+?)( title=(.*?)){0,1}\]
<img src="$1" class="$3" width="$4" alt="$6" />
\[image=(\S*?.(gif|jpeg|jpg|png)) align=(left|right) height=(\d+?)( title=(.*?)){0,1}\]
<img src="$1" class="$3" height="$4" alt="$6" />Nice idea, Marcel; had started going down that route originally but, as you say, it's not exactly user friendly and it presents the same problem of how to exclude an attribute entirely from the output if it isn't assigned a value in the input.
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Search is your friend
“I was having a mildly paranoid day, mostly due to the
fact that the mad priest lady from over the river had
taken to nailing weasels to my front door again.” |
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HuwR
Forum Admin
United Kingdom
20579 Posts |
Posted - 09 April 2008 : 10:16:29
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| the basic problem you have is that the replace expression does not allow conditional replaces, so it can not know what to do if one of your variables is not in the initial string. the only way to do that would be to use the matches collection of the regexp object, however in classic ASP that is very limited |
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HuwR
Forum Admin
United Kingdom
20579 Posts |
Posted - 09 April 2008 : 10:20:19
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if you don't mind it not having "" round the attributes you could do something as simple as
\[image=(.*\.(gif|jpeg|jpg|png))\s+((height=(?:[\d]+\s*))|(width=(?:[\d]+\s*))|(title=(?:[^\s]+\s*))|(align=(?:[^\s]+\s*)))*]
<img src=$1 class=$2 $3 $4 $5 $6 $7/> |
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