Hi all, 

I noticed that \doifinstring produces quite strange output if a command
follows immediately (or with any amount of spaces) after the substring 
I am searching for:

-------------------------------------MWE
\starttext
\def\xxx{asdf \bf Z:\bf asdf}         % strange
\def\xxx{asdf \bf Z: \bf asdf}        % strange
\def\xxx{asdf \bf Z:: \bf asdf}       % OK
\def\xxx{asdf \bf Z: text \bf asdf}   % OK
\def\xxx{asdf \bf Z:{} \bf asdf}      % OK

\doifinstring{Z:}{\xxx}{yes!}
\stoptext
----------------------------------OUTPUT
fbf@yes!
fbf@yes!
yes!
yes!
yes!
----------------------------------------

If I insert another character, text or {} between them
(with or without spaces), all is ok.

I would like to ask what is the cause of this behavior and how to 
use the \doifinstring to prevent the "fbf@" on the output. 

Best wishes

Tomáš
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