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Prior to this commit, the SpEL Tokenizer threw an IllegalStateException when an unsupported character was detected in a SpEL expression; however, the Javadoc for ExpressionParser.parseExpression() states that it throws a ParseException if an exception occurred during parsing. This commit addresses that issue by throwing a SpelParseException for an unsupported character in a SpEL expression, using a new UNSUPPORTED_CHARACTER enum constant in SpelMessage. Closes gh-33767