Question

1. The phone numbers collected from questionnaire is a mess. Design a regular expression to filter out those numbers that are stored in the standard format         “+00-0-0000-0000” from the file called “Q1.txt” and redirect the results to the “cleaned.txt”.

Note: Only +61-3-9214-4980 and +61-3-9285-7706 are the valid results.    [10 Marks]

Answer 1

The following is the code for above question

import re
fin=open("/content/Q1.txt","r") #open file in read mode
data=fin.readlines()
fout=open("cleaned.txt","w")  #open file in write mode
for item in data:
  match=re.search("^[+][0-9]{2}[-][0-9]{1}[-][0-9]{4}[-][0-9]{4}$",item.strip()) #Accepts only numbers of type "+00-0-0000-0000"
  if match:  #if match then accept the number and write it into cleaned.txt file
    fout.write(item)
fin.close()  #close the Q1.txt file
fout.close()  #close the cleaned.txt file

I am also attaching the screenshots for the above code and output as well.

Input:

+61-0-1234-3333
+91-3-5656-4232
+1-5-4564-2222
+51-5002-3323-8787
43-0-4444-4343
+78-0-343-3422
+01-9-2662-276
+20-6-3535-4001

Output:

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