fig09_07.pl

来自「PERL语言资料 可以用于PERL程序设计」· PL 代码 · 共 40 行

#!usr/bin/perl
# Fig. 9.4: index.pl
# Demonstration of the index function

use warnings;
use strict;

my $string = "babaabababbaababbababababaaabblp";
print "We're going to number each bab.\n";
print $string, "\n";

my $foundAt = 0;
my $offset = 0;
my $label = 1;
my %positions;

while ( ( $foundAt = index( $string, 'bab', $offset ) ) > -1 ) {
   $positions{ $foundAt } = $label++;
   $offset = $foundAt + 1;
}

foreach ( 0 .. length( $string ) - 1 ) {
   print $positions{ $_ } ? $positions{ $_ } : " ";
}


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