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For example, the following element has a phone number validation that alerts the user when they do not enter a valid phone number.

To apply a validation rule:

1. Click .
2. Select either:
   
   • Text input
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   • Text area
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   • Text label.
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3. Click Image Removed Image Added. See <Online _ form _ builder > - Properties tab.
   The Properties tab is displayed.
   
4. Select a validation option from the Validation drop-down list.
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   The validation rule is applied to the selected element.
   
   Tip: You can preview the validation by clicking  and typing non-conforming content into the field. For example, text into a Mobile number field. 
   
   
   
5. Repeat steps 2 through 4 to add additional validation rules.
6. Click .