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Given this:

        <span ng-repeat="extra in extras">
            <br>
            <input type="checkbox" ng-click="addExtra()"  value="{{extra.id}}" >{{extra.name}} - <strong>{{extra.real_price}}</strong>
        </span>

How do i make the {{extra.real_price}} to output only numbers using filters ?

Example: extra.real_price being 'from 400€' to transform to '400'

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Ok, i'm stupid, solution is in the AngularJS Developer Guide: http://docs.angularjs.org/guide/dev_guide.templates.filters.creating_filters

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