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- String Helper Functions

- # IsInString()

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  Lua SwxWare v13.10

  This helper function checks is a given substring is part of a given string.

      local bFound = IsInString(str, substr)

  This function returns a boolean value.

  Examples:

      local bFound = IsInString("+494012345", "123")

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

      --> bFound = true

      local bFound = IsInString("Erika Mustermann", "Herbert")

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

      --> bFound = false

  By Tom Wellige

  - June 9, 2022
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