Addition of Container.getAll() method as discussed in #970

lib/winston/container.js

@@ -65,6 +65,19 @@ module.exports = class Container {
     return this.add(id, options);
   }
 
+  /**
+   * Retreives all `winston.Logger` instances for the specified `regex`.
+   * @param {!string} id - The regrex to match the Loggers to get.
+   * @returns {Map<Logger>} - A Map of Logger instances matching the regex.
+   */
+  getAll(regex) {
+    if(regex) {
+      return new Map([...this.loggers].filter(([key]) => key.match(regex)));
+    }
+
+    return this.loggers;
+  }
+
   /**
    * Check if the container has a logger with the id.
    * @param {?string} id - The id of the Logger instance to find.