use strict;
my $str = '#lang sicp
(define (square x) (* x x))
(define (average x y) (/ (+ x y) 2))
; using block scope
(define (sqrt x)
; x is always the same -- "4" or whatever we pass to it, so we don\'t need that
; in every single function that we define, we can just inherit it from above.
(define (improve guess) (average guess (/ x guess)))
(define (good-enough? guess) (< (abs (- (square guess) x)) 0.001 ))
(define (sqrt-iter guess) (if (good-enough? guess) guess (sqrt-iter (improve guess))))
(sqrt-iter 1.0)
)
(sqrt 4)
(define (inc x) (+ x 1))
(define (dec x) (- x 1))
';
my $regex = qr/\(\s*define\s*(\(.*?\))/msp;
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