Can you escape characters you don't want the analyzer to modify

[Scott Smith]

Suppose I have a string like "ab@cd%d".  My analyzer will turn this into "ab cd 
d".  Can I pass it "ab\@cd\%d" and force it to treat it as a single word?  I 
want to use the Query parser, but I don't want it messing with fields that have 
not been analyzed.