PHP Regular Expressions
Which one of the following preg PHP function is used to do a find and replace on a string or an array?

preg_find_replace()
preg_findre()
preg_find()
preg_replace()

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PHP Regular Expressions
What will be the output of the following PHP code?
$author = "nachiketh@example.com";
$author = str_replace("a","@",$author);
echo "Contact the author of this article at $author.";

Contact the author of this article at n@chiketh@ex@mple.com
Error
Cont@ct the @uthor of this @rticle @t n@chiketh@ex@mple.com
Contact the author of this article at nachiketh@ex@mple.com

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PHP Regular Expressions
POSIX stands for

Portable Operating System Interface for Linux
Portative Operating System Interface for Linux
Portative Operating System Interface for Unix
Portable Operating System Interface for Unix

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