Add mhchemCE utility

content/dataset.html

@@ -24,6 +24,7 @@ draft: false
 <script src="/js/numberUtils.js"></script>
 <script src="/js/indexDB.js"></script>
 <script src="/js/ArrayExtensions.js"></script>
+<script src="/js/mhchemCE.js"></script>
 <script>
   function adjustSticky() {
     const height = $("nav").height()
@@ -253,13 +254,7 @@ draft: false
             return "Unnamed set"
           }
         case "molecule":
-          const mhchemCE = /^\\ce\{(.*)\}$/
+          return mhchemCE.extract(value)
-          const m = value.match(mhchemCE)
-          if (m) {
-            return m[1]
-          } else {
-            return value
-          }
           break;
         default:
           return value.toString()
@@ -545,7 +540,6 @@ draft: false
         }
         for (const [molecule, moldat] of datadic.entries()) {
           var printmol = true;
-          const mhchemCE = /^\\ce\{.*\}$/
           for (const [jsonex, exdat] of moldat.entries()) {
             const ex = JSON.parse(jsonex)
             Reflect.setPrototypeOf(ex[0], state.prototype)

static/js/mhchemCE.js

@@ -0,0 +1,16 @@
+class mhchemCE{
+  static extract(string) {
+    const m = string.match(mhchemCE.regEx)
+    if (m) {
+      return m[1]
+    } else {
+      return string
+    }
+  }
+  static test(string){
+    return mhchemCE.regEx.test(string)
+  }
+  static get regEx(){
+    return /^\\ce\{(.*)\}$/
+  }
+}