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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