Feature/ Support regex path names

.gitignore

@@ -27,3 +27,6 @@ build/Release
 # Dependency directory
 # https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git
 node_modules
+
+# editor configuration
+.vscode

index.js

@@ -42,8 +42,8 @@ function CleanWebpackPlugin(paths, options) {
   // determine webpack root
   options.root = options.root || path.dirname(module.parent.filename);
 
-  // allows for a single string entry
-  if (typeof paths == 'string' || paths instanceof String) {
+  // allows for a single string entry or a regular expression
+  if (typeof paths == 'string' || paths instanceof String || paths instanceof RegExp) {
     paths = [paths];
   }
 
@@ -52,6 +52,27 @@ function CleanWebpackPlugin(paths, options) {
   this.options = options;
 }
 
+/**
+ * Gives back file paths that match the given pattern
+ * 
+ * @param {string} root 
+ * @param {RegExp} pattern 
+ * @returns [string]
+ */
+function resolveRegexPaths(root, pattern) {
+  const rootChildren = fs.readdir(root);
+
+  const resolvedPaths = [];
+
+  rootChildren.forEach(child => {
+    if (pattern.test(child) === true) {
+      resolvedPaths.push(child);
+    }
+  });
+
+  return resolvedPaths;
+}
+
 var clean = function() {
   var _this = this;
   var results = [];
@@ -86,6 +107,16 @@ var clean = function() {
     webpackDir = upperCaseWindowsRoot(webpackDir);
   }
 
+  // Resolve RegExp paths.
+  _this.paths.reduce((acc, currentPath) => {
+    if (path instanceof RegExp) {
+      const resolvedPaths = resolveRegexPaths(_this.options.root, currentPath);
+      return [...acc, ...resolvedPaths];
+    }
+    return [...acc, currentPath]    
+  }, []);
+
+
   // preform an rm -rf on each path
   _this.paths.forEach(function(rimrafPath) {
     rimrafPath = path.resolve(_this.options.root, rimrafPath);