zsh expansions/substitutions

'expansion' covers parameter (aka variable) substitution, globbing, etc.

advanced shell globbing (taken from zsh FEATURES file)
ls file<20-> matches file20, file30, file100, etc
ls *.(c|pro) matches *.c and *.pro
globbing which you never knew you wanted
ls **/foo searches recursively for "foo" in subdirs
glob qualifiers
i love these.  that's why it's in yellow
check it out beavis: ls *(@)
basically a super-easy replacement for find -blah -bleh
use ^ in the () to negate a qualifier, eg ls *(^R)
numeric glob sort; ie: (1, 2, ... 10) rather than (1, 10, 2, ...)
you will hate it when you don't have this
csh-style colon (:) modifiers
eg: echo subdir/*(:t)  # :t means the tail
:h (head), :u (upper), :l (lower), :s// (subst), :o (sort)