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I need help validating " First Name" input field. The validation is the field should not accept numbers and special characters. There is no button at this point . But message should pop as user tries to enter data with numbers and special characters.In other words it should only accept characters.

can someone send me the snipplet firstname validation

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You just need to specify a pattern:

<lightning:input ... pattern="[a-zA-Z]*" 
                 messageWhenPatternMismatch="Please use only letters." />

If you're not familiar with regular expressions, you can read about them here (or other resources).

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