How to disable special characters in the phone ir numbers field

  • Hello

    For a phone field in my form i’d like to disable some charcters (symbols) like * / – etc.
    Just a + for the country code will be OK. Also the “erase” of a blank would be fine ??

    The result should be +49123456789

    Any suggestions how can i do this?

    Best regards
    Alex

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