Fix regex for parsing url. (#137)

Added `_` to the valid characters in the hostname and removed ':'.

Fixes #136.

Author: chfritz

src/utils/network_utils.js

@@ -74,7 +74,7 @@ const NetworkUtils = {
   },
 
   getAddressAndPortFromUri(uriString) {
-    let regexStr = /(?:http:\/\/|rosrpc:\/\/)?([a-zA-Z\d\-.:]+):(\d+)/;
+    let regexStr = /(?:http:\/\/|rosrpc:\/\/)?([a-zA-Z\d\-_.]+):(\d+)/;
     let match = uriString.match(regexStr);
     if (match === null) {
       throw new Error ('Unable to find host and port from uri ' + uriString + ' with regex ' +  regexStr);