Thanks Jeanne, and everyone else who replied. I will stick to underscore as my 'non-alphanumeric' character (I happen to need one). I am sorry there isn't a true reference description of the language. If such a thing existed, it would not only tell us about variable names but would also tell us about naming other things like stacks and fields, which may or may not be be "any string". Can I have a field called "?? AB_&#" for example? Don't worry, I don't really want one!
This is from "About containers, variables, and sources of value":
Variable names The names of variables must consist of a single word and may contain any combination of letters, digits, and underscores (_). The first character must be either a letter or an underscore.
Here are some examples of legal variable names:
someVariable picture3 my_new_file _output
Here are some names that cannot be used as variable names:
3rdRock -- starts with a digit this&That -- "&" cannot be used My Variable -- more than one word
Avoid giving a variable the same name as a custom property. If you refer to a custom property, and there is a variable by the same name, Revolution uses the contents of the variable as the name of the custom property. Generally this will produce unexpected results.
Note: Global variables whose names begin with "gRev" are reserved by the Revolution development environment.
(As Alex notes, there are characters other than letters, numbers, and
underscores that will work in variable names, but this isn't
guaranteed to go on working, so those characters are best avoided.)
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A note on the RR online documentation:
Although it does appear logical that this info should appear in "About containers, variables, and sources of value", my attempts to find "names" in the docs didn't work, nor could I find a synonym that led directly to the info Jeanne has revealed - and yet it was there. I guess the dictionary only covers the language description and not the topics part of the docs, but the topics search wasn't much help either (and the searching was incredibly slow on my G5 iMac). As ever, it's knowing how to find the information that is tricky - thank goodness for this list!
Graham
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Graham Samuel / The Living Fossil Co. / UK and France
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