Jowersman,
If you haven't flown 135 I wouldn't worry about knowing the regs. Most places don't expect you to know the regs that you haven't flown under. If you only have 91 instructing experience then know 91 regs very well. However, you should know the AIM like the back of your hand no matter what part you fly under.
I'm interviewing this weekend. It seems like most guys for the FO spots are low-time. I have almost 1900TT 1860PIC and 135 experience, I was hoping for a CA position but I don't have any turbine. Not sure if I'm going to take it if offered the job, interview experience is good though and I should be fresh since I did my recurrent checkride last Sat.
Good luck!