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Member "wxGTK-2.8.9/src/regex/README" of archive wxGTK-2.8.9.tar.gz:

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    1 wxWindows regex
    2 ---------------
    3 This is a version of Henry Spencer's regex, which was taken from the
    4 source of TCL (Toolkit Command Language).  It implements POSIX regular
    5 expressions and also supports Unicode and some Perl5 extensions.
    6 
    7 The modifications made by the wxWindows team are as follows:
    8 
    9 regcustom.h
   10 -----------
   11 Types and constants appropriate for our use of the library are defined
   12 here.
   13 
   14 regex.h
   15 -------
   16 This is unmodified. Note though, that a portion of it (clearly marked)
   17 is copied from regcustom.h as part of the build process.
   18 
   19 regc_locale.c
   20 -------------
   21 This module provides character classifications.
   22 
   23 The current version from Tcl supports only a Unicode build. The
   24 original code from Henry Spencer, on the other hand, was ASCII only.
   25 Therefore, in order to support both, code from the ASCII version has been
   26 incorporated into the Unicode version, conditionally compiled depending
   27 on wxUSE_UNICODE.
   28 
   29 The only non-trivial dependencies were: Tcl_UniCharToUpper,
   30 Tcl_UniCharToLower and Tcl_UniCharToTitle. The implementations of these
   31 have also been incorporated (from Tcl). These in turn depend only the data
   32 tables in tclUniData.c (which is unmodified). At some point wxWindows
   33 may have it's own Unicode character classification code, at which point
   34 these should be used instead.
   35 
   36 Other dependencies (on Tcl_DString) have been eliminated using wxWindows
   37 wxChar functions.
   38 
   39 The ASCII version has also been extended to support character
   40 classifications based on the current locale rather than ASCII only.
   41