There were two issues with the unit extraction regex: - it didn't take the inches, feet, arcminutes and arcseconds symbols into accounts, which aren’t letters but ' and "; - some units have more than one B_UNIT_DEF_* flag. This allows extracting feet, inches, square millimeters, cubic millimeters, arcminutes, and arcseconds. Reviewed By: mont29 Differential Revision: https://developer.blender.org/D16144