message: Change client-side validation of group IDs to match synapse
diff: @@ -55,8 +55,8 @@ export default React.createClass({
  _checkGroupId: function(e) {
  let error = null;
  - if (!/^[a-zA-Z0-9]*$/.test(this.state.groupId)) {
  - error = _t("Community IDs may only contain alphanumeric characters");
  + if (!/^[a-z0-9=_-\.\/]*$/.test(this.state.groupId)) {
  + error = _t("Community IDs may only contain characters a-z, 0-9, or '=_-./'");
  }
  this.setState({
  groupIdError: error,
  