[AlexanderKrieger]

2 years, 9 months ago #35432

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For regex, you need to Subscribe to the button event. Then execute a custom script, getting the contents of the textfield.

Either by
var element = sap.ui.getCore("Application").byId("MY UIELEMENT ID").getValue();

or by getting the binded variableHolder via:

var element = this.getGlobals().getVar("MY VARIABLEHOLDER").getValue();

then inserting the data into a regex Javascript. Examples:
https://www.w3schools.com/jsref/jsref_obj_regexp.asp

Further you have 2 ways of designing the display of an error message:
Either Toast-Message and Red Border on Elements

or:
Assigning a new Variable with an error or success-message and putting that variable in an UI-Event.