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- String Helper Functions

- # IsEmailString()

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  Lua SwxWare v13.10

  This helper function checks, if the given string is an email address.

      local bEmail = IsEmailString(str)

  This function returns a boolean value.

  The check for a valid email email address is quite simple, it will just be checked if there is an "@" character within the given string.

  Example:

      local bEMail = IsEmailString("[email protected]")

      PBXScript.OutputTrace ("bEMail = " ..tostring(bEMail))

      --> bEMail = true

  By Tom Wellige

  - June 9, 2022
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