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PHP Regular Expressions

PHP Regular Expressions
[:alpha:] can also be specified as.

[A-za-z]
[a-z]
[A-z]
[A-Za-z0-9]

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PHP Regular Expressions
What will be the output of the following PHP code?
$foods = array("pasta", "steak", "fish", "potatoes");
$food = preg_grep("/^s/", $foods);
print_r($food);

Array ( [3] => potatoes )
Array ( [0] => potatoes )
Array ( [0] => pasta [1] => steak [2] => fish [3] => potatoes )
Array ( [1] => steak )

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PHP Regular Expressions
What will be the output of the following PHP code?
$username = "jasoN";
if (ereg("([^a-z])",$username))
echo "Username must be all lowercase!";
else
echo "Username is all lowercase!";

Username must be all lowercase!
No Output is returned
Username is all lowercase!
Error

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PHP Regular Expressions
Say we have two compare two strings which of the following function/functions can you use?
1. strcmp()
2. strcasecmp()
3. strspn()
4. strcspn()

1 and 2
All of the mentioned
None of the mentioned
3 and 4

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PHP Regular Expressions
Which one of the following functions is used to search a string?

preg_found
preg_match
preg_search
preg_find

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

p+
p#
P?
p*

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MORE MCQ ON PHP Regular Expressions

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