fix and test for issue #57

Author: gunnarmein-ts

nerdamer.core.js

@@ -6382,7 +6382,12 @@ var nerdamer = (function (imports) {
 
             //only even bother to check if the string contains e. This regex is painfully slow and might need a better solution. e.g. hangs on (0.06/3650))^(365)
             if(/e/gi.test(e)) {
-                e = e.replace(/\-*\d+\.*\d*e\+?\-?\d+/gi, function (x) {
+                // negative numbers
+                e = e.replace(/\-+\d+\.?\d*e\+?\-?\d+/gi, function (x) {
+                    return scientificToDecimal(x);
+                });
+                // positive numbers that are not part of an identifier
+                e = e.replace(/(?<![A-Za-z])\d+\.?\d*e\+?\-?\d+/gi, function (x) {
                     return scientificToDecimal(x);
                 });
             }

package.json

@@ -6,7 +6,7 @@
     "description": "javascript light-weight symbolic math library",
     "name": "nerdamer-prime",
     "license": "MIT",
-    "version": "1.2.3",
+    "version": "1.2.4",
     "homepage": "https://github.com/together-science/nerdamer-prime",
     "directory": {
         "lib": "./"

spec/core.spec.js

@@ -1955,6 +1955,11 @@ describe('Nerdamer core', function () {
             nerdamer.clearVars();
             expect(nerdamer('aa').text()).toEqual('aa');
         });
+
+        it('should parse variables with scientific number patterns in the subscript', function () {
+            expect(nerdamer('x_a1e1').text()).toEqual('x_a1e1');
+        });
+
     });
 
     describe('User functions 1', function () {

spec/test.js

@@ -39,7 +39,7 @@ let text;
 let x;
 
 try {
-    x = nerdamer("dot(1,2)");
+    x = nerdamer("x_a1e1");
     console.log(x.text());
 } catch (error) {
     console.log("error "+error)