Allow 1-character Tag Names (cmseaton42#18)

* Fix tag regex to allow 1-character tag names

Fix for cmseaton42#17

* adds a test for 1-characters numeric tag names

* Increments version

package.json

@@ -1,6 +1,6 @@
 {
     "name": "ethernet-ip",
-    "version": "1.1.6",
+    "version": "1.1.7",
     "description": "A simple node interface for Ethernet/IP.",
     "main": "./src/index.js",
     "scripts": {

src/tag/index.js

@@ -201,7 +201,7 @@ class Tag extends EventEmitter {
                     this.emit("KeepAlive", this);
                 }
             }
-            
+
         }
     }
 
@@ -421,7 +421,7 @@ class Tag extends EventEmitter {
         const tag = tagname.split(".");
 
         const test = tag[tag.length - 1];
-        const regex = /^[a-zA-Z_][a-zA-Z0-9_]*([a-zA-Z0-9_]|\[\d+\])$/i; // regex string to check for valid tagnames
+        const regex = /^[a-zA-Z_][a-zA-Z0-9_]*([a-zA-Z0-9_]*|\[\d+\])$/i; // regex string to check for valid tagnames
         return typeof tagname === "string" && regex.test(test) && test.length <= 40;
     }
     // endregion

src/tag/tag.spec.js

@@ -26,6 +26,9 @@ describe("Tag Class", () => {
             expect(fn(undefined)).toBeFalsy();
             expect(fn(`hello${311}`)).toBeTruthy();
             expect(fn("hello.how3")).toBeTruthy();
+            expect(fn("randy.julian.bubbles")).toBeTruthy();
+            expect(fn("a.b.c")).toBeTruthy();
+            expect(fn("1.1.1")).toBeFalsy();
             expect(fn({ prop: "value" })).toBeFalsy();
             expect(fn("fffffffffffffffffffffffffffffffffffffffff")).toBeFalsy();
             expect(fn("ffffffffffffffffffffffffffffffffffffffff")).toBeTruthy();