Description:

The package provides many (purely expandable) tools for LaTeX:
- Extensive list management (csv lists, lists of single
tokens/characters, etoolbox lists): * purely expandable loops
(csvloop, forcsvloop, etc.) * conversion (csvtolist, etc.)) *
addition/deletion (csvadd, listdel, etc.) - Expansion and group
control: \expandnext, \ExpandAfterCmds, \AfterGroup... - Tests
on tokens, characters and control sequences (\iffirstchar,
\ifiscs, \ifdefcount, \@ifchar...) - Tests on strings
(\ifstrnum, \ifuppercase, \DeclareStringFilter...) - Purely
expandable macros with options (\FE@testopt, \FE@ifstar) or
modifiers (\FE@modifiers) - Some purely expandable numerics
(\interval, \locinterplin). The package is dependent on the
etex and the etoolbox packages.