AdamL AdamL - 2 years ago 96
Javascript Question

Regular expression to extract valid cell references from a spreadsheet formula

I am attempting to extract valid cell references and range references from a spreadsheet formula, using Google Apps Script (Javascript).

A valid cell reference is one or two letters, followed by consecutive numbers not starting with a zero. Either the letter(s) or the number(s) may or may not be preceded by a $ character. The entire reference can't be preceded/proceeded by a letter, number or underscore (in which case it may be part of either a spreadsheet function or the name of a named range) or a colon (in which case it may be part of range reference).

The range reference regex (

) seems to work well; but my cell reference regex (
) fails to find a match. Would be great if someone could point out what I'm doing wrong.

function myFunction()
var formula = '=A100+B$2:2+INDIRECT("A2:B")+$C3-SUM($D$1:$E5)';
var fSegments = formula.split('"'); // I want to exclude references within double quotation marks
var rangeRefRe = /[^0-9a-zA-Z_$]([0-9a-zA-Z$]+?:[0-9a-zA-Z$]+)(?![0-9a-zA-Z_])/g;
var cellRefRe = /[^0-9a-zA-Z_$:](\${,1}[a-zA-Z]{1,2}\${,1}[1-9][0-9]*)(?![0-9a-zA-Z_:])/g;
var refResult;
var references = [];
for (var i = 0; i < fSegments.length; i += 2)
while (refResult = rangeRefRe.exec(fSegments[i]))
while (refResult = cellRefRe.exec(fSegments[i]))

Answer Source

JavaScript doesn't support this part of your regex: {,1}. To allow 0 or 1 occurrences it would need to be {0,1}, or you can replace that with just ?:

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