plugins/java-i18n/testData/highlighting/InvalidEscape.properties

\ a\ b\ =x<warning descr="Invalid string escape">\x</warning>
a\n\r\b2 = x\\\n\r v
spaceinthemiddle=a<warning descr="Invalid string escape">\ </warning>b
ii<warning descr="Invalid string escape">\d</warning>nnvalidkey
framingSpaces = \ xxx\ \ \