My python sol :
import re def hide_number(phone): if re.match(r"^(?:\d{3}-){2}\d{4}", phone): return re.sub(r"\d{2}-\d{4}", "XX-XXXX", phone, 2) else: return False
One liner (lambda exp) :
hide_number = lambda phone: re.sub(r"\d{2}-\d{4}", "XX-XXXX", phone, 2) \ if re.match(r"^(?:\d{3}-){2}\d{4}", phone) else False
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My python sol :
One liner (lambda exp) :