'search' constraint for sap.ui.model.type.String causing SyntaxError in XML view

OpenUI5 version: 1.28

I want to use a search constraint to valuate an user input. It is meant for a sap.ui.model.type.String type. The regex I want to use has been tested in online tools and works for controller based validation approaches (e.g. change).

I am not sure what is causing the SyntaxError. Is it ‘search’ or the regex?

                <Label required="true" text="Staff - search"/>
                <Input 
                  placeholder="AB-12345-C" 
                  value="{ path: 'StaffNr', 
                           type : 'sap.ui.model.type.String',
                           constraints: {
                             search: '^[a-zA-Z]{2}-\d{5}-[a-zA-Z]{1}$'
                           }
                         }"/>



  Object {name: "SyntaxError", message: "Bad string", at: 142, text: "{ path: 'Meins',                  type : 'sap.ui.m…}-[a-zA-Z]{1}$'                 }               }"}

[codeworrior]

The top level parser for binding strings (base.BindingParser) calls the parseJS when it detects a binding object. So inside a binding object you don’t need to escape curly braces, only the Javascript escaping is necessary. When curly braces occur top level in the binding string (outside a binding object), they need to be escaped.

Might be a bit hard to understand and was mainly driven by the implementation, but at the end it reduces the necessary escaping.

Last but not least, things get worse in an XMLView as the embedding of the binding string in an XML attribute might require additional escaping (XML entities). That’s a post processing (for the encoder) resp. a preprocessing for a decoder. Means: when writing a binding string in an XMLView, first follow the above rules for escaping a binding strings, then apply the rules for XML escaping to the result.

[uhlmannm]

I have created backlog item CPOUI5MODELS-920 for tracking.