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After checking the input looks like a GB telephone number using the pattern above, the next step is to extract the NSN part so that it can be checked in greater detail for validity and then formatted in the right way for the applicable number range. The display format must be corrected by later logic if the wrong format for this number has been used by the user on input. The pattern allows any format to be used with any GB number. Before you start, there are four concepts that need to be separated. These are "input format", "valid number range and valid number length for this range", "storage format" and "display format".