use strict;
my $str = 'Linux is
A. A Graphic Software
B. A Driver
C. A Line Controller Software
D. An Operating System
ANSWER: D
Which feature helps in compress and contain the collection of files in to one
A. Zip
B. Shortcut
C. Icon
D. Extract
ANSWER: A
What is php?
A. Php is a language.
B. Php creates HTML.
C. Php is fun.
D. none of these.
ANSWER: D
Which is YII-2?
A. Framework.
B. Tool.
C. None of these
ANSWER: A,B';
my $regex = qr/(?mi)
^
(?!
\h*
(?: [A-Z] \h* \. | ANSWER \h* : )
)
\h*
(?<question> \S .*? ) # (1)
\?? \h* \s* ^ \h* A \h* \. \h*
(?<A> .*? ) # (2)
\h*
\s*
(?:
^ \h* B \h* \. \h*
(?<B> .*? ) # (3)
\h*
(?:
\s* ^ \h* C \h* \. \h*
(?<C> .*? ) # (4)
\h*
(?:
\s* ^ \h* D \h* \. \h*
(?<D> .*? ) # (5)
\h*
(?:
\s* ^ \h* E \h* \. \h*
(?<E> .*? ) # (6)
\h*
)?
)?
)?
)?
\s* ^ \h* ANSWER \h* : \h*
(?<answer1> [A-F] ) # (7)
(?:
\h* , \h*
(?<answer2> [A-F] ) # (8)
)?
/xp;
if ( $str =~ /$regex/g ) {
print "Whole match is ${^MATCH} and its start/end positions can be obtained via \$-[0] and \$+[0]\n";
# print "Capture Group 1 is $1 and its start/end positions can be obtained via \$-[1] and \$+[1]\n";
# print "Capture Group 2 is $2 ... and so on\n";
}
# ${^POSTMATCH} and ${^PREMATCH} are also available with the use of '/p'
# Named capture groups can be called via $+{name}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Perl, please visit: http://perldoc.perl.org/perlre.html