AngularJS 1.3 pattern validation binding not working -

i have been using regex pattern validation angularjs last several versions , has worked fine.

my application requires validation patterns exposed scope property, corresponding angularjs validation directive bound. prior v1.3, looked this:

// on controller $scope.validationpattern = "^\\d*$"; // allow numeric digits  <!-- in html page ---> <input type="text" name="age" ng-pattern="/{{validationpattern}}/" /> 

having updated angularjs v1.4 (bypassing v1.3), find above approach no longer works. looking @ migration notes v1.3, see expected behavior , new approach required, looks this:

// on controller $scope.validationregexp = /^\d*$/; // use regexp instead of string  <!-- in html page ---> <input type="text" name="age" pattern="{{validationregexp}}" /> 

however, can't work. if place validation pattern inline (within html input element) works fine, when moved onto scope object , bound pattern or ng-pattern directive, no validation occurs.

here's jsfiddle demonstrates problem.

any suggestions please?

you should use name of scope variable:

<input type="text" name="age" ng-pattern="validationpattern" />