Glob matching

[probablycorey]

@mcolyer wishes he had a way to do some basic globbing:

".vim-mode":
  '" [a-zA-Z]': "vim-mode:register-prefix"

This syntax would restrict the possible keys entered without needing to exhaustively listing them. If it's easier maybe it could just accept regexps here rather than trying to create a subset?

Note: This is also required for f and t motions.