I'd found a solution
http://stackoverflow.com/a/22612561/2923711
correct solution is
<input type="text" id="pay-account" name="account" class="form-control"
ng-model="model" ng-required="true" required="required"
ng-pattern="field.valueRegexp" >
$scope.field.valueRegexp = /^\d{3,6}$/;
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