fixed regex

lib/index.js

@@ -39,7 +39,7 @@ var Worker = function () {
 
 			var portIndex = debugVars.findIndex(function (debugArg) {
 				//get index of debug port specifier
-				return (/^--(debug|inspect)(-brk)?\d*/.test(debugArg)
+				return (/^--(debug|inspect)(-brk)?(=\d+)?$/.test(debugArg)
 				);
 			});
 

src/index.js

@@ -23,7 +23,7 @@ class Worker {
 			}
 
 			let portIndex = debugVars.findIndex(debugArg => { //get index of debug port specifier
-				return (/^--(debug|inspect)(-brk)?\d*/).test(debugArg);
+				return (/^--(debug|inspect)(-brk)?(=\d+)?$/).test(debugArg);
 			});
 
 			if (portIndex >= 0) { //set new port, ignore "-brk", it doesn't work