How to create custom Validation for UI Component Form? I want to create Validation for maximum character, not for max-word which is already available in Magento 2. if any body knows please share the procedure.Thanks
Try to do like this :
<item name="validation" xsi:type="array"> <item name="required-entry" xsi:type="boolean">true</item> <item name="max_text_length" xsi:type="number">250</item> </item>
clean cache and check it.