17 lines
507 B
Python
17 lines
507 B
Python
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import re
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def normalize_number(phone_number):
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pattern = re.compile("([\+]*[1][ -])*(\(*[2-9][0-9][0-9]\)*)[- .]([0-9][0-9][0-9])[ -.]([2-9][0-8][0-9][0-9])")
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if not pattern.match(phone_number):
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raise ValueError("Ungültige Telefonnummer")
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normalized_number = re.sub("\+*\(*\)*", "", phone_number)
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normalized_number = re.sub("[ .]", "-", normalized_number)
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if normalized_number[0] != str(1):
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normalized_number = "1-" + normalized_number
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return normalized_number
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