DMN FEEL warn if en-dash is present as a character in expression ---------------------------------------------------------------- Key: DROOLS-4812 URL: https://issues.redhat.com/browse/DROOLS-4812 Project: Drools Issue Type: Enhancement Components: dmn engine Reporter: Matteo Mortari Assignee: Matteo Mortari Priority: Major This is taken from the DMN spec : {code:java} (amount *rate/12) / (1 – (1 + rate/12)**-term) {code} however this would fail to parse correctly as the first subtraction sign is an "en-dash" (0x2013) and not a minus/hyphen sign (0x2D) {code:java} (amount *rate/12) / (1 – (1 + rate/12)**-term) ^ (amount *rate/12) / (1 - (1 + rate/12)**-term) {code} while an "em-dash" is much more noticeable, this "en-dash" can be confused more easily, especially depending on the font used: {code:java} – en-dash - minus, or hyphen (standard) — em-dash (much more noticeable in the difference) {code} It is suggested for the parser/compile to emit a warning if the en-dash is used in an expression --or potentially if it's the last character in a viable alternative. A good way to check for the behavior is to use the wrong expression above to exhibit the behavior when the en-dash is misplaced for a minus sign for a subtraction operation.