Regular Expressions MCQ question and answer with solution

1

PHP has long supported two regular expression implementations known as _______ and _______.
1. Perl
2. PEAR
3. Pearl
4. POSIX

A) 1 and 2 B) 2 and 4 C) 1 and 4 D) 2 and 3

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

2

Which one of the following regular expression matches any string containing zero or one p?

A) p+ B) p* C) P? D) p#

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

3

[:alpha:] can also be specified as.

A) [A-Za-z0-9] B) [A-za-z] C) [A-z] D) [a-z]

Discuss

Answer & Solution

Answer: Option B

Solution:

[:alpha:] is nothing but Lowercase and uppercase alphabetical characters.

4

How many functions does PHP offer for searching strings using POSIX style regular expression?

A) 7 B) 8 C) 9 D) 10

Discuss

Answer & Solution

Answer: Option A

Solution:

ereg(), ereg_replace(), eregi(), eregi_replace(), split(), spliti(), and sql_regcase() are the functions offered.

5

What will be the output of the following PHP code?

<?php
$username = "jasoN";
if (ereg("([^a-z])",$username))
  echo "Username must be all lowercase!";
else
  echo "Username is all lowercase!";
?>

A) Error B) Username must be all lowercase! C) Username is all lowercase! D) No Output is returned

Discuss

Answer & Solution

Answer: Option B

Solution:

Because the provided username is not all lowercase, ereg() will not return FALSE (instead returning the length of the matched string, which PHP will treat as TRUE), causing the message to output.

6

POSIX implementation was deprecated in which version of PHP?

A) PHP 4 B) PHP 5 C) PHP 5.2 D) PHP 5.3

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

7

POSIX stands for

A) Portable Operating System Interface for Unix B) Portable Operating System Interface for Linux C) Portative Operating System Interface for Unix D) Portative Operating System Interface for Linux

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

8

What will be the output of the following PHP code?

<?php
$text = "this istsome text thatnwe might like to parse.";
print_r(split("[nt]",$text));
?>

A) this is some text that we might like to parse. B) Array ( [0] => some text that [1] => we might like to parse. ) C) Array ( [0] => this is [1] => some text that [2] => we might like to parse. ) D) [0] => this is [1] => some text that [2] => we might like to parse.

Discuss

Answer & Solution

Answer: Option D

Solution:

The split() function divides a string into various elements, with the boundaries of each element based on the occurrence of a defined pattern within the string.

9

Which of the following would be a potential match for the Perl-based regular expression /fo{2,4}/ ?
1. fol
2. fool
3. fooool
4. fooooool

A) Only 1 B) 2 and 3 C) 1, 3 and 4 D) 1 and 4

Discuss

Answer & Solution

Answer: Option B

Solution:

This matches f followed by two to four occurrences of o.

10

Which among the following is/are not a metacharacter?
1. /a
2. /A
3. /b
4. /B

A) Only 1 B) 1 and 3 C) 2, 3 and 4 D) 2 and 4

Discuss

Answer & Solution

Answer: Option A

Solution:

/A, /b and /B are metacharacters. A: Matches only at the beginning of the string. b: Matches a word boundary. B: Matches anything but a word boundary.

Regular Expressions MCQ question and answer with solution | PHP Programming