Peng Yu <pengyu...@gmail.com> asked:
> I can't find an existing perl subroutine (in the library) to find
> every occurrence of a substring in a string. The following webpage
> "Example 3b. How to find every occurrence" uses a loop to do so. But
> I'd prefer a subroutine. Could you let me know if such a subroutine is
> available in perl library?
If there isn't one, just roll your own:
#!/usr/bin/perl -w
use strict;
sub find_match {
my( $text, $match, $offset ) = @_;
$offset ||= 0;
if( $[ - 1 < ( $offset = index( $text, $match, $offset ) ) ){
return( $offset, find_match( $text, $match, $offset+1) );
}
}
my $text = 'abaabaabaaabaaaaabaaabaaabaabaaaaabaabbbaabaabaaab';
my $match = 'aab';
print "matches found at: ", join(', ', find_match( $text, $match ) ), "\n";
__END__
HTH,
Thomas
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