Regular Expressions - 1,2

PHP has long supported two regular expression implementations known as _______ and _______
i) Perl
ii) PEAR
iii) Pearl
iv) POSIX

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

[:alpha:] can also be specified as..

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

POSIX implementation was deprecated in which version of PHP?

POSIX stands for

Which of the following would be a potential match for the Perl-based regular expression /fo{2,4}/ ?
i) fol
ii) fool
iii) fooool
iv) fooooool

Which among the following is/are not a metacharacter?
i) \a
ii) \A
iii) \b
iv) \B

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

Say we have two compare two strings which of the following function/functions can you use?
i) strcmp()
ii) strcasecmp()
iii) strspn()
iv) strcspn()

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

Which one of the following functions can be used to concatenate array elements to form a single delimited string?

Which one of the following functions finds the last occurrence of a string, returning its numerical position?