Replace Question 3

[ZimZangZoom]

Hello,

I am currently making a program that will allow people to use custom tags that i have specified in the script.
For example: #NAME# is replaced with $name

Currently i have been using code such as.
$body =~s/#NAME#/$name/g;

But what if i wanted to replace #NAME# with a sub routine called &name;

How can i do such a process ?

Drew

 

[ZimZangZoom]

Well maybe i figured it out.. But i dont know if it is thebest way,., this works.. but is there anything better ?


if ($body =~ /#NAME#/i) {
&name;
}

 

[ishnid]

You can use the /e flag in your regexp to have the replacement treated as code, rather than merely as a quoted string:

$body =~s/#NAME#/name()/ge;

Now, #NAME# will be replaced by the whatever name() returns.

 

[ZimZangZoom]

Thanks ishnid

Worked like a charm!

Drew

 

[PaulTEG]

ish, this pointed out even after beers, is brilliance ...
mait thú, a mhic

--paul

cigless ...

 

[waiterm]

A star for ishnid, I'd actually never thought of doing that, but now I know how I might actually use it!

Rob Waite

http://www.hostpipe.co.uk?src=TT

 

[PaulTEG]

a word of caution on substitution with execution
I'm just after coming across a vulnerability with phpBB 2.0, where a value that's submitted is substituted in such a way.

Causing arbitrary code to be run on the server.

because you're calling a specified routine, it won't be an issue here, but if you're considering running such a regex on user submitted values.

http://www.phpbb.com/phpBB/viewtopic.php?f=14&t=240513

Don't be crying when there's bainne ar an úrlar (For Mike: spilt milk)


Happy Holidays
--Paul

cigless ...