Write a function called isphonenumber () to recognize a pattern 415-555-4242 without using regular expression and also write the code to recognize the same pattern using regular expression
Program:-
import re
def isphonenumber(numStr):
if len(numStr) != 12:
return False
for i in range(len(numStr)):
if i==3 or i==7:
if numStr[i] != "-":
return False
else:
if numStr[i].isdigit() == False:
return False
return True
def chkphonenumber(numStr):
ph_no_pattern = re.compile(r'^\d{3}-\d{3}-\d{4}$')
if ph_no_pattern.match(numStr):
return True
else:
return False
ph_num = input("Enter a phone number : ")
print("Without using Regular Expression")
if isphonenumber(ph_num):
print("Valid phone number")
else:
print("Invalid phone number")
print("Using Regular Expression")
if chkphonenumber(ph_num):
print("Valid phone number")
else:
print("Invalid phone number")
Output:-
Enter a phone number : 444-654-5656
Without using Regular Expression
Valid phone number
Using Regular Expression
Valid phone number
Enter a phone number : 45A4-444-878
Without using Regular Expression
Invalid phone number
Using Regular Expression
Invalid phone number
