Tomonaga Tokuyama Enterprises

In C, Objective-C, C++,

# pragma mark xxx
// TODO:  xxx
// FIXME:  xxx
// !!! xxx
// ??? xxx

In Python,

# !!!!: xxxx
# TODO: xxxx
# MARK: xxxx
# ????: xxxx
# FIXME: xxxx

To replace exiting ### xxxx ### comments with ### MARK: xxx, find ###\s*([0-9a-zA-Z ]+)### (in regex mode), and replace with ### MARK: \1.

(Xcode User Guide: Text Editor)