JavaScript的

var string = "sasa<app>sasa<server>sasa<client>ddsdds";
string.match(/\b\w+(?=\>)/g);

Ruby的

string = "sasa<app>sasa<server>sasa<client>ddsdds";
array = string.scan(/\b\w+(?=\>)/);

"sasa<app>sasa<server>sasa<client>ddsdds".scan(/\<([^>]*)\>/)

Perl的，抛个砖头，期待更简洁的代码

my $st="sasa<app>sasa<server>sasa<client>ddsdds";
my @arr;
push @arr, $1 while ($st=~s/<([^>]+)>//);

print join(",", @arr);

$str = "sasasasasasaddsdds";
preg_match_all("/<(.*)>/U", $str, $matches);

Perl

$a = 'sasa<app>sasa<server>sasa<client>ddsdds';
@ary = $a =~ /<(.+?)>/g;
print "@ary";