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Check PhoneNumber Format

here is the python code for check correct format of phonenumber

def isPhoneNumber(text):
    if len(text) != 12:
     return False
    for i in range(0, 3):
        if not text[i].isdecimal():
            return False
    if text[3] != '-':
        return False
    for i in range(4, 7):
        if not text[i].isdecimal():
            return False
    if text[7] != '-':
         return False
    for i in range(8, 12):
        if not text[i].isdecimal():
            return False
    return True

print('415-555-4242 is a phone number:')
print(isPhoneNumber('415-555-4242'))
print('Moshi moshi is a phone number:')
print(isPhoneNumber('Moshi moshi'))    

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