sa-compile, when extracting the regex's into the scanner*.re files, seems to
interpret backslahses as either '\"' or '\""'.

Here's the example I used on the sa-users mailing list...

Original rule's regex:

/(?:fr(?:o|0|\(\))(?:n|\|\\\|)[t7]p[a\@4]g[e3]\s\d+)/i

Scanner.re result:

"fro|\""|"            {RET("__XM_Sft_Ms_Fp_L33T");}

It produces the above output, instead of "fro|\|".

This comes from the file in the URL field of this ticket. Do an sa-compile with
the file in your spamassassin config, and you'll see this and a few more
examples of the same thing. I've even tried escaping it with the hex code for a
backlash, but I get the same results. :-/ Always either '\"' or '\""'.