Has anyone written an iRule to filter CVE-2014-6271?

Below are two ASM signatures that have to be created separately. The concept on the pcre version is this will detect the initial brackets which are necessary and then the white space, to multiple white spaces before the curly which is also necessary. Whitespaces are usually ignored and can be repeated so but a white space can not be between the () or else it will fail so this signature detects the variances that could be used.

headercontent:"shellshock"; nocase;

pcre: "/()(\s+)?{/Hi";