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Posted to dev@httpd.apache.org by Nick Gearls <ni...@gmail.com> on 2009/03/19 15:43:27 UTC

mod_substitute & \n

I found a problem with handling of new lines in mod_substitute.
Take the following file as example
	<html>
	<body>
	</body>
	</html>
	

1. If I use "Substitute  s/\n/1/", it works almost correctly:
	<html>
	1<body>
	1</body>
	1</html>
	1
Note that it does not replace the new line, but adds the replacement 
after it. This is quite weird.

2. If I use "Substitute s/<body>\n/<body>2/" or
    "Substitute s/\n<body>/<body>2/", the file is unchanged


Could somebody explain how newlines are handled ?
Can we use them inside a pattern ?

Thanks,


Nick

Re: mod_substitute & \n

Posted by "Plüm, Rüdiger, VF-Group" <ru...@vodafone.com>.

Using newlines in the expression does not make sense as
mod_substitute (similar to sed) does apply the regular expression
line by line. You cannot process multiline regexs with mod_substitute.

Regards

Rüdiger 

> -----Ursprüngliche Nachricht-----
> Von: Nick Gearls 
> Gesendet: Donnerstag, 19. März 2009 15:43
> An: dev@httpd.apache.org
> Betreff: mod_substitute & \n
> 
> I found a problem with handling of new lines in mod_substitute.
> Take the following file as example
> 	<html>
> 	<body>
> 	</body>
> 	</html>
> 	
> 
> 1. If I use "Substitute  s/\n/1/", it works almost correctly:
> 	<html>
> 	1<body>
> 	1</body>
> 	1</html>
> 	1
> Note that it does not replace the new line, but adds the replacement 
> after it. This is quite weird.
> 
> 2. If I use "Substitute s/<body>\n/<body>2/" or
>     "Substitute s/\n<body>/<body>2/", the file is unchanged
> 
> 
> Could somebody explain how newlines are handled ?
> Can we use them inside a pattern ?
> 
> Thanks,
> 
> 
> Nick
> 
>