[mkgmap-dev] regular expressions in tag tests

Hi all! I want to use a regular expression in a tag test, and I don't know what type of regular expression syntax is used in mkgmap. There is only one example, and it's not enough. My tags are strings made from floating point numbers, in fixed field length with leading spaces, in common RE syntax they would be '\ *[0-9]+\.00' (optional spaces, followed by a point and two zeroes) I want to pick out those with '000', '500', '00' and '50' before the point (doing contours) - of course a modulo operation on the floating point value would also work, but I haven't found that, either... How would I specify that in mkgmap? (P.S. I don't know Java, so please don't tell me it's in 'standard Java notation' ;-) Kay