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### goodReadingName
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```perl
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$valid = goodReadingName($name);
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```
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This function checks if *Readingname* `$name` is a valid format which consists of
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* upper and lowercase letters [a-zA-Z]
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* digits [0-9]
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* underscore `_`
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* minus `-`
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* dot `.`
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* slash `/`
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If the identifier starts with a dot `.`, it's considered to be an internal identifier and is treated differently in visualization, i.e. hidden.
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For valid identifiers a true value is returned, false otherwise. This function can be used in if-constructs directly to test whether a *Readingname* is valid or not. |