Re: [xsl] A regular expression for the content of any processing-instruction

[David Carlisle <davidc@xxxxxxxxx>]

On 23/02/2012 13:43, Costello, Roger L. wrote:
> Hi Folks,
>
> I created a regex for the content of any PI.

You'll find an xpath regex for that in the sources of htmlparse.xsl
xml 1.1 spec says

[16] PI ::= '<?' PITarget (S (Char* - (Char* '?>' Char*)))? '?>'
[17] PITarget ::= Name - (('X' | 'x') ('M' | 'm') ('L' | 'l'))


> Is my regex correct?
>
> Here is the structure of the content of any PI:
>
> 1. Zero or more whitespace characters. This is expressed as: \s*


No white space allowed here

> 2. One or more XML name characters. This is expressed as: \c+

It has to start with a name-start character you can have <?N1 but not
<?1N so \i\c* except it cant start with XmL . but the meaning of \i and
\c change at xml 1`.` or xml 1.0 5th edition so whether or not \i and \c
mean what you want depends on what you want and what the systen you are
using means by them.


> 3. Zero or more whitespace characters. This is expressed as: \s*
no
> 4. The equals sign. This is expressed as: =
no
> 5. Zero or more whitespace characters. This is expressed as: \s*
>
> 6. Either a single- or double-quote character. This is expressed as:
> ["']
no
> 7. One or more characters (any kind of character). This is expressed
> as: .+
no
> Note: the period allows any character. That's not correct. What is
> correct?
>
> 8. Either a single- or double-quote character. This is expressed as:
> ["']
no
> 9. Repeat (1) - (8) one or more times. This is expressed as: ( ...
> )+
no
> 10. Zero or more whitespace characters. This is expressed as: \s*
no
> Here is the resulting regex:
>
> (\s*\c+\s*=\s*["'].+["'])+\s*
no
> Do you agree?

No, you are giving attribute syntax, PI's don't have attributes their
content is everything up to the next occurrence of ?>
> /Roger

David


________________________________________________________________________
The Numerical Algorithms Group Ltd is a company registered in England
and Wales with company number 1249803. The registered office is:
Wilkinson House, Jordan Hill Road, Oxford OX2 8DR, United Kingdom.

This e-mail has been scanned for all viruses by Star. The service is
powered by MessageLabs. 
________________________________________________________________________