From: Eric Hodel <drbrain@...7.net>
Date: 2006-07-19T08:27:40+09:00
Subject: Re: How to preserve $~ when extending Regexp#match

On Jul 18, 2006, at 3:13 PM, Brendan Baldwin wrote:

> Because of the magical nature of the $~ global variable and its
> derivatives $&,$+,$`,$',$1-9, we wind up losing it from scope with  
> this
> extension to the Regexp class:
>
>   /myregexp/.match("test my regexp")
>   $~ # <= nil
>
> Is anyone out there aware of any way to set $~ in the "caller's"  
> binding
> from within Regexp#match *without* requiring a manual call_stack to be
> implemented via set_trace_func?

I played around with this for MetaRuby and couldn't find a way to  
implement it.  I believe it is impossible outside of set_trace_func/ 
evil.rb level hackery.

-- 
Eric Hodel - drbrain@segment7.net - http://blog.segment7.net
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