Question

Read the following program and answer the question.

import re

text = "CCIS-327E CCIS-227B CELS-112 SC-124B CCIS-328"

pattern = _____________

regex = re.compile(pattern)

regex.findall(text)

Which expression should be filled in the above program to get the following output:

[‘CCIS-327E’, ‘CCIS-227B’]

Group of answer choices

r'CCIS-[0-9A-Z]+'

r’CCIS-[0-9]+[A-Z]+'

r'CCIS-[0-9]+'

r'CCIS-[A-Z]+'

Answer 1

Ans:

# According to the question after looking at the different answer choices which are given

# we use the following regular expression rules to check which is the right option

# [] - Matches Characters in brackets

# [A-Z]   Any single character in the range A-Z

# [0-9] Any Single digit in the range 0-9

# [0-9A-Z] Any single character in the range 0-9 or A-Z

# And the quantifier required to define how many characters need to be matched used here is

# ( the plus quantifier / Positive closure ) '+' - 1 or More of the pattern or character specified

# Thus Since all the given choices start with 'CCIS-' this is the common string which gets matched

# after which the pattern in the 2nd option would give us the required output

# REQUIRED ANSWER PROGRAM

import re # for importing and using the re module
# the text string which needs to be matched
# it can be a string, a line of sentences, paragraphs or even streams of strings in the form of files
text = "CCIS-327E CCIS-227B CELS-112 SC-124B CCIS-328"

pattern = r'CCIS-[0-9]+[A-Z]+' # the pattern specified in the regular expression context

regex = re.compile(pattern) # the re.compile function changes the regex pattern or any other string into a python re object

print(regex.findall(text)) # the resultant matched output
# in the form of all the strings present in a list

# giving us our required output [‘CCIS-327E’, ‘CCIS-227B’]

# since only these two string patterns comprised of a combination of digits and alphabets

# it is our required correct answer

# CORRECT ANSWER - option B or - r’CCIS-[0-9]+[A-Z]+'

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# THANK YOU SO MUCH IN ADVANCE