Re: Invalid Capture Index

[Rici Lake <lua@...>]

On 6-Jul-07, at 7:53 PM, Martin Schröder wrote:

> 007/7/7, Mark Edgar <medgar123+lua-l@gmail.com>:
> > So, POSIX (and other C implementations) have an extension to printf()
> > format specifiers allowing them to specify an argument by its
> > position.  So, you can use:
>
> Do you have a source for that claim?
>
> SUSV doesn't have it:
> http://www.opengroup.org/onlinepubs/009695399/functions/printf.html

It's the sixth paragraph in that link you pasted:

> [XSI]  Conversions can be applied to the nth argument after the format 
> in the argument list, rather than to the next unused argument. In this 
> case, the conversion specifier character % (see below) is replaced by 
> the sequence "%n$", where n is a decimal integer in the range 
> [1,{NL_ARGMAX}], giving the position of the argument in the argument 
> list. This feature provides for the definition of format strings that 
> select arguments in an order appropriate to specific languages (see 
> the EXAMPLES section).

(With some more material following.)