Hello,
I tested the reported scenario and noticed that the anchors with empty space in them works as expected.
Nevertheless, if you want to strip the spaces you can use the OnClientPasteHtml event to modify the inserted content:
If you want to add validation in the LinkManager.ascx, you can see how to customize it in the following live demo:
Customize Built-in Dialogs.
Best regards,
Rumen
the Telerik team
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