setAlias using a regex (#336)

created a new function that allows to use a regex to manipulate item
name

src/datasource-zabbix/dataProcessor.js

@@ -156,6 +156,18 @@ function setAlias(alias, timeseries) {
   return timeseries;
 }
 
+function setAliasByRegex(alias, timeseries) {
+  timeseries.target = extractText(timeseries.target, alias);
+  return timeseries;
+}
+
+function extractText(str, pattern) {
+  var extractPattern = new RegExp(pattern);
+  var extractedValue = extractPattern.exec(str);
+  extractedValue = extractedValue[0]
+  return extractedValue;
+}
+
 function scale(factor, datapoints) {
   return _.map(datapoints, point => {
     return [
@@ -281,7 +293,8 @@ let metricFunctions = {
   top: _.partial(limit, 'top'),
   bottom: _.partial(limit, 'bottom'),
   timeShift: timeShift,
-  setAlias: setAlias
+  setAlias: setAlias,
+  setAliasByRegex: setAliasByRegex
 };
 
 let aggregationFunctions = {

src/datasource-zabbix/metricFunctions.js

@@ -149,13 +149,24 @@ addFuncDef({
   defaultParams: ['24h'],
 });
 
+//Alias
+
 addFuncDef({
   name: 'setAlias',
   category: 'Alias',
   params: [
-    { name: 'alias', type: 'string'}
+    { name: 'alias', type: 'string' }
   ],
-  defaultParams: [],
+  defaultParams: []
+});
+
+addFuncDef({
+  name: 'setAliasByRegex',
+  category: 'Alias',
+  params: [
+    { name: 'aliasByRegex', type: 'string' }
+  ],
+  defaultParams: []
 });
 
 _.each(categories, function(funcList, catName) {