Details
I have a page that has the following search in it:
%SEARCH{"ReqNo" scope="topic" regex="on" nosearch="on" nototal="on" casesensitive="on" format="$percntCALC{$IF($NOT($FIND(%TOPIC%,$formfield(ReqParents))), <nop>, [[$topic]] - $formfield(ReqShortDescript) %BR% )}$percnt"}%
After using Kupu on the web page, this gets translated to:
%SEARCH{"ReqNo" scope="topic" regex="on" nosearch="on" nototal="on" casesensitive="on" format="$percntCALC{$IF($NOT($FIND(%TOPIC%,$formfield(ReqParents))), , <a href="$topic">$topic</a> - $formfield(ReqShortDescript) %BR% )}$percnt"}%
This translation of:
[[$topic]] to <a href="$topic">$topic</a>
is what breaks the search.
Note that this is reported below as
"Linkstyle [[%TWIKIWEB%.WebHome][TWiki web]] is altered"
but is noted as only an annoyance and not actually breaking functionality.
OK, there was actually a bug related to the nop. Fixed in SVN 7416.
Note that if you intend to edit variables, you really need to turn on variable spans. By default the plugin tries to pass variables through verbatim, but the reverse translation is impossible without a full twiki parse of the text being saved to recognise TWiki variables. This means that (for example) the [[ in your example will be escaped with nops when the topic is saved, as it will be asusme that you were trying to enter two [ signs.
CC