clean
Creates a valid variable name from the input string - spaces converted to underscores and invalid characters removed.
Syntax
string = clean(varname)
The following characters are removed from the input string:
(){}!/"£$%^&*\[]
Example
vn = clean("name full of [chars like this[] and that()!")
print vn
NAME_FULL_OF_CHARS_LIKE_THIS_AND_THAT