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Final exercise on RegEx for Python

Guys, I need ur help :3 The final task on RegEx for Python is to write a code which insures whether a given telephone number consists of 8 numbers in total and begins with either 1, 8 or 9. My code passes 4 tests out of 5, but unfortunately the one it doesn't is closed. So I can't see what's wrong... https://code.sololearn.com/c130Cl2bcI0H/?ref=app

2nd Feb 2021, 11:08 PM
Dimitry Buylin
Dimitry Buylin - avatar
6 Respostas
+ 4
pattern = r"^[189]\d{7}
quot; # should do the job (^ symbolize string start, $ string end)
2nd Feb 2021, 11:52 PM
visph
visph - avatar
+ 7
David Ashton I feel you! I've been studying and practicing RegEx over the past few days because it seems like it can be very useful in certain cases(I'm working on a few web scraping projects myself that benefit from the power of RegEx)... I must say though, RegEx has the most alien-like syntax of anything I've seen in all of programming!.!.!
3rd Feb 2021, 5:10 AM
Reacy.Py
Reacy.Py - avatar
+ 5
You need to check length of number as well, re.match doesn't restrict user from typing any amount of numbers even tho it will match first 8 numbers only. So you can do a check to see if length of string is 8 then proceed further . if len(str)==8 and re.match(pattern,str): print("Valid") else: print("Invalid")
2nd Feb 2021, 11:34 PM
Abhay
Abhay - avatar
+ 4
Not being crazy about regex, I did it this way 😄 n = input() if len(n) == 8 and n.isdigit(): if n[0] == "1" or n[0] == "8" or n[0] == "9": print("Valid") quit() print("Invalid")
3rd Feb 2021, 3:21 AM
David Ashton
David Ashton - avatar
+ 1
I didn't expect so many answers :D looks like my mistake was in NOT stating maximal quantity of digits in a number. And again, I admire the variability of coding (especially on the example of David Ashton). Thank you guys!
3rd Feb 2021, 2:44 PM
Dimitry Buylin
Dimitry Buylin - avatar
0
I did this way 🙂 import re #your code goes here num = input() pattern = r"[189]\d[1-8]" if re.match(pattern, num) and len(num) == 8: print("Valid") else: print("Invalid")
3rd Feb 2021, 8:57 AM
Ferhat Sevim
Ferhat Sevim - avatar