Consistent regexes

Author: visnup

src/xlsx.js

@@ -68,7 +68,7 @@ function valueOf(cell) {
 
 function parseRange(specifier = ":", {columnCount, rowCount}) {
   specifier += "";
-  if (!specifier.match(/^[A-Z]*[0-9]*:[A-Z]*[0-9]*$/))
+  if (!specifier.match(/^[A-Z]*\d*:[A-Z]*\d*$/))
     throw new Error("Malformed range specifier");
   const [[c0 = 0, r0 = 0], [c1 = columnCount - 1, r1 = rowCount - 1]] =
     specifier.split(":").map(fromCellReference);