fu is a drop-in replacement for the finduses filter of noweb that lets the user specify what identifiers look like. Here's the description from the code itself:
fu: finduses replacement, with the ability to specify the pattern
    for an identifier on the command line.

Usage: fu [pattern] [-noquote]

  pattern is a Perl regexp for matching an identifier.
  If you put parentheses in there, use (?: ... ) so that they
  won't match outside the pattern!  If pattern is not given,
  uses \w[\w\d]*, which matches C/C++ identifiers.

  -noquote says not to look inside quoted code.

Version 0.2 of 26 May 1997

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Last updated 17 Feb 1999