My Camel II certainly has an index entry for regular expressions.

I'm sure it has. My claim was about early prints of the third edition. Currently, I have 2 prints of the third edition.

From the index of the July 2000 print, page 1053, first column:

reftype function, 317
regex (see patterns)
regexes (see patterns)
regexps (see patterns)
registry (Microsoft Windows), manipulating,
          398, 875
regular files, testing for, 28
re-initialization expressions, loops, 116
[download]

From the index of the March 2001 print, page 1054, first column:

reftype function (attributes pragma), 317
regexes (see patterns)
regexps (see patterns)
registry (Microsoft Windows)
   manipulating, 398, 551, 875
   .pl extensions and, 490
regular expressions (see patterns)
regular files, testing for, 28
[download]

Abigail