[mkgmap-dev] upper and lower case

Hi, I wonder are there functions to convert values to upper or lower cases? I can't find anything in the style manual. I'm doing a lot of comparison of name fields such as name~'[Aa]irport' and think it would be much more efficient to first copy the name to an upper or lower case version and then do equality matches instead of the regular expression matches (this would also detect any oddly capitalized names such as AIrport). Any suggestions? Thanks, Mike