RES-Reach variable names should follow [ISO8879], HTML 4.0 Draft specifications:

ID and NAME tokens must begin with a letter ([A-Z a-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").

RES-Reach does not enforce these or any restrictions on variable names. It makes the best attempt it can to interpret the names it is given. Violating the rules can result in unexpected results: e.g. using accented characters in a variable names may result in problems with case-insensitive comparisons, embedding group identifiers in variable names may result in unexpected values, beginning and ending a variable name in square brackets will cause it to be interpreted as a database field value, etc.

RES-Reach variable names are not case-sensitive, but their values are.