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