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% This macro source file is from the four volume series
% "TeX in Practice" by Stephan von Bechtolsheim, published
% 1993 by Springer-Verlag, New York.
% Copyright 1993 Stephan von Bechtolsheim.
% No warranty or liability is assumed.
% This macro may be copied freely if no fees other than
% media cost or shipping charges are charged and as long
% as this copyright and the following source code itself
% is not changed. Please see the series for further information.
%
% Version: 1.0
% Date: May 1, 1993
%
%
% This source code is documented in 24.1.16, p. III-298.
% Original source in file "macros4.TEX", starting line 866.
\wlog{L: "restring.tip" ["macros4.TEX," l. 866, p. III-298]}%
% This file DOES belong to format "texip."
\InputD{testsubs.tip}
\InputD{endrec.tip}
\catcode`\@ = 11
\def\ReplaceSubStrings #1#2#3#4{%
    \def\@ReplaceResult{#1}%
    \edef\@ReplaceMain{#2}%
    \edef\@ReplaceSub{#3}%
    \edef\@ReplaceSubRep{#4}%
    \@ReplaceSubStrings
}
\def\@ReplaceSubStrings{% 
    \RecursionMacroEnd
        {\if\SubStringConditional{\@ReplaceMain}{\@ReplaceSub}}%
        {\@ReplaceSubStringsDo}{\@ReplaceSubStringsDone}%
}
\def\@ReplaceSubStringsDoX{%
    \def\@ReplaceSubStringsDoA ##1%
}%
\def\@ReplaceSubStringsDo{% 
    \expandafter\@ReplaceSubStringsDoX \@ReplaceSub
                                    ##2\@EndReplaceSubStrings{%
        \edef\@ReplaceMain{##1\@ReplaceSubRep ##2}%
    }%
    \ShowX{\@ReplaceSubStringsDoA}%
    \ShowX{\@ReplaceMain}%
    \expandafter\@ReplaceSubStringsDoA\@ReplaceMain
        \@EndReplaceSubStrings
    \ShowX{\@ReplaceMain}%
    \@ReplaceSubStrings
}
\def\@ReplaceSubStringsDone{% 
    \expandafter\edef\@ReplaceResult{\@ReplaceMain}%
}
\catcode`\@ = 12