在字符串内用index my $stuff = 'Howdy world!'; my $where = index($stuff,'wor'); print $where; # 6 my $stuff = 'Howdy world!'; my $where1 = index($stuff,'w'); #2 my $where2 = index($stuff,'w',$where1+1); #6 my $where3 = index($stuff,$where2+1); #-1 在字符串内用 rindex 搜所 my $last_slash = rindex("/etc/password",'/'); #4 my $fred = 'Yabba dabba doo!'; my $where1 = rindex($fred,'abba'); #7 my $where2 = rindex($fred,'abba',$where1-1); #1 my $where3 = rindex($fred,$where2-1); #-1 用substr处理子串 $part = substr($string,$initial_position,$length); my $mineral = substr('Fred J. Plintstone',8,5); #Plint my $rock = substr 'Fred J. Plintstone',13,100; #stone my $string = 'Hello, world!'; substr($string ,5) = 'Goodby'; #Goodby, world! substr和index 一起使用 my $long = 'some very very long string'; my $lin = index($long,'l'); #15 my $right = substr($long,index($long,'l')); #long string mmy $string = 'dkfkkakdfredddddd'; substr($string,-13) =~ s/fred/barney/g; #dkfkkakdbarneyddddd 高级排序 sub by_number { if ($a<$b) {-1} elsif ($a>$b){ 1 } else {0} } my @some_numbers = qw /3 4 6 1 2 9/; # 3 4 6 1 2 9 my @result = sort by_number @some_numbers; # 123469 sub by_number {$a <=> $b} my @some_numbers = qw /3 4 6 1 2 9/; my @result = sort by_number @some_numbers; 按哈希值排序 my %score = ('bareny' => 195,'fred' => 205,'dino' => 30,'bamm-bamm' => 195); my @winners = sort by_score keys %score; sub by_score { $score{$b} <=> $score{a} } print "@winners"; #fred bamm-bamm dino bareny 哈希值查找Fred my $flag = 0; foreach my $key(keys %name) { next unless $key =~ /Fred/; $flag = $key; last; }总结
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