Excel formula grammar in BNF or any other notations
bnf, excel, excel-formula, formula, javascript
Solution
MS-XLS has a free-form grammar (tries to be an EBNF but is far from formal)
More hints are available in MS-OE376 and section L.2.16 of ECMA-376.
But to answer your question, there is no official BNF
Problem
I am looking for a grammar of Excel formulas in BNF or another notation. We need to parse the input formula with JavaScript to check its validity and the actual formula evaluation will then take place on the server side.