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To: Pedro Alves <palves@redhat.com>
Subject: Re: [PATCH v2 2/5] Further cleanup/modernization of  gdb.base/commands.exp
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Date: Wed, 09 Nov 2016 16:09:00 -0000
From: Simon Marchi <simon.marchi@polymtl.ca>
Cc: gdb-patches@sourceware.org
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On 2016-11-09 10:59, Pedro Alves wrote:
> And I'm wondering whether this below as well would be a good idea,
> or whether it'd obfuscate?  If a good idea, maybe we'd put the new
> variable in gdb.exp.

...

> @@ -45,7 +50,7 @@ proc_with_prefix gdbvar_simple_if_test {} {
>  	     "else" \
>  	     "  p/x 0xdeadbeef" \
>  	     "end"] \
> -	"\\\$\[0-9\]* = 0xdeadbeef" \
> +	"$valnum_re = 0xdeadbeef" \
>  	"#1"


That's not bad.  I was going to suggest using {} instead of "" to get 
rid of most backslashes (untested):

-"\\\$\[0-9\]* = 0xdeadbeef"
+{\$[0-9]* = 0xdeadbeef}

but with the variable it looks good as well.