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PHP Regular Expressions

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

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

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PHP Regular Expressions
Which one of the following functions will convert a string to all uppercase?

str_uppercase()
strtoupper()
uppercase()
struppercase()

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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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PHP Regular Expressions
What will be the output of the following PHP code?
$number = array(0,1,two,three,four,5);
$num = preg_grep("/[0-5]/", $number);
print_r($num);

Array([2]=>two [3]=>three [4]=>four)
Array([0]=>0 [1]=>1 [2]=>two [3]=>three [4]=>four [5]=>5)
Array([0]=>0 [1]=>1 [5]=>5)
Array([1]=> 1)

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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!";

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

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PHP Regular Expressions
How many functions does PHP offer for searching and modifying strings using Perl-compatible regular expressions.

9
7
8
10

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