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Regular Expressions MCQ question and answer with solution | PHP Programming

Learn Regular Expressions MCQ Questions and answers with easy and logical explanations. Regular Expressions MCQ in PHP programming provides all type of technical mcq questions which is important for technical exams, cumpus exams and other entrance examination Page-3 section-1

21
What will be the output of the following PHP code? 
<?php
$number = array(0,1,two,three,four,5);
$num = preg_grep("/[0-5]/", $number);
print_r($num);
?>
Discuss
Answer & Solution
Answer: Option D
Solution:
The preg_grep function is used to search an array for specific patterns and then return a new array based on that filtering.
22
What will be the output if we replace the line $num = preg_grep(“/[0-5]/”, $number); with $num = preg_grep(“/[0-5]/”, $number, PREG_GREP_INVERT);?
Discuss
Answer & Solution
Answer: Option B
Solution:
When we include PREG_GREP_INVERT, this will invert our data, so instead of outputting numbers it will output our non-numeric values.
23
Which one of the following functions is used to search a string?
Discuss
Answer & Solution
Answer: Option A
Solution:
The function returns 1 if search was successful else returns 0.
24
What will be the output of the following PHP code? 
<?php
$name = "What is your name?"
if (preg_match("/name/"),$name)
  echo "My name is Will Pitt ";
else
  echo "My name is not Will Pitt ";
if (preg_match("/are/"))
  echo "I am great"
else
  echo "I am not great";    
?>
Discuss
Answer & Solution
Answer: Option C
Solution:
The code uses preg_match to check for a keyword and replies based on whether it is true (1) or false (0).
25
Which one of the following preg PHP function is used to do a find and replace on a string or an array?
Discuss
Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
26
What will be the output of the following PHP code? 
<?php
$str = "Hello! My name is Cameron Fox. Coffee?"
$find = array('/is/','/coffee/');
$replace = array('/was/','/tea/');
echo preg_replace ($find, $replace, $str);
?>
Discuss
Answer & Solution
Answer: Option D
Solution:
Coffee was not replaced because the preg_replace function is case sensitive. Therefore it treats coffee and Coffee differently.
27
Which one of the following preg PHP functions is used to take a string, and put it in an array?
Discuss
Answer & Solution
Answer: Option B
Solution:
The string is broken up into different values in the array based upon your input.
28
What will be the output of the following PHP code? 
<?php
$line = "You like dogs. I hate dogs. We should marry."
$sen = preg_split('/./', $line);
print_r($sen);
?>
Discuss
Answer & Solution
Answer: Option C
Solution:
We use a ‘.’ period to split the data, therefor giving each sentence it’s own array entry.
29
Which one of the following is not a preg PHP function?
Discuss
Answer & Solution
Answer: Option C
Solution:
The function preg_matchall does not exist. preg_match_all is a preg function.
30
Parameter flags was added in which version of PHP?
Discuss
Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board