DSL Parser "eval"

rule "PatternTest"
when
$pli:Item( title matches "^Test\s*")
then
#
end

this one compiles but on Runtime it ends in an Exception when title looks for example like this "BlaBla (Test)".

as workaround i thought about using the next part, but

rule "PatternTest"
when
$pli:Item( eval(title.matches("^Test\s*")) )
then
#
end

it resolves into, also it shouldn't (because title.matches() is Java Code a shouldn't be parsed by the DSL Parser itself):

SyntaxfehlerRule Compilation error : [Rule name=OnlineStreaming Start,
agendaGroup=MAIN, salience=100, no-loop=true]
com/p7s1/swi/phoenix/n24/Rule_OnlineStreaming_Start_0.java (19:923) :
Invalid escape sequence (valid ones are \b \t \n \f \r \" \'
)