[PATCH] config: use simpler regexp syntax to get dot version

[Bryce Harrington]

On Thu, Apr 02, 2015 at 07:20:00PM -0700, Bill Spitzak wrote:
> I wasted a lot of time before I figured out that I needed to add those
> square brackets to get this to work. Sigh...

Lots clearer too.

Reviewed-by: Bryce Harrington <bryce at osg.samsung.com>
 
> ---
>  configure.ac |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/configure.ac b/configure.ac
> index 6bbec59..271eec3 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -141,7 +141,7 @@ if test "x$enable_documentation" = "xyes"; then
>  		AC_MSG_ERROR([Documentation build requested but graphviz's dot not found. Install graphviz or disable the documentation using --disable-documentation])
>  	fi
>  	AC_MSG_CHECKING([for compatible dot version])
> -	dot_version=`$DOT -V 2>&1|$GREP -oP '(?<=version\W)@<:@0-9.@:>@*(?=\W(.*))'`
> +	dot_version=`$DOT -V 2>&1|$GREP -o ['[0-9]*\.[0-9]*\.[0-9]*']`
>  	AS_VERSION_COMPARE([$dot_version], [2.26.0],
>  	                   [AC_MSG_RESULT([no])
>  	                    AC_MSG_ERROR([Graphviz dot $dot_version too old. Graphviz 2.26+ required for documentation build. Install required graphviz version or disable the documentation using --disable-documentation])],
> -- 
> 1.7.9.5
> 
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