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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 24.1.15.1, p. III-293.
+% Original source in file "macros4.TEX", starting line 661.
+\wlog{L: "testsubs.tip" ["macros4.TEX," l. 661, p. III-293]}%
+% This file DOES belong to format "texip."
+\InputD{showx.tip}
+\catcode`\@ = 11
+\newif\if@TestSubString
+\def\SubStringConditional #1#2{%
+ TT\fi
+ \edef\@MainString{#1}%
+ \edef\@SubStringConditionalTemp{{#1}{#2}}%
+ \expandafter\@SubStringConditional\@SubStringConditionalTemp
+}
+\def\@SubStringConditional #1#2{%
+ \def\@TestSubS ##1#2##2\@Del{%
+ \def\@TestTemp{##1}%
+ }%
+ \ShowX{\@TestSubS}%
+ \@TestSubS #1#2\@Del
+ \ShowX{\@TestTemp}%
+ \ifx\@MainString\@TestTemp
+ \@TestSubStringfalse
+ \else
+ \@TestSubStringtrue
+ \fi
+ \if@TestSubString
+}
+\catcode`\@ = 12