import re
phoneNumRegex = re.compile(r'(?<!\d)\d{3}\-\d{3}\-\d{4}(?!\d)')
mo1 = phoneNumRegex.search('My number is 415-555-42424854-201.')
if mo1 is not None:
print('Phone number found: ' + mo1.group())
else:
print("Pattern is not matched")
mo2 = phoneNumRegex.search('My number is 415-555-4242.')
if mo2 is not None:
print('Phone number found: ' + mo2.group())
else:
print("Pattern is not matched")
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