print("$1:") while ('abcdefgh' =~ /(.)/g);
a:b:c:d:e:f:g:h:

print("$1:") while ('vowels' =~ /([aeiou])/g);
o:e:

##</code><code>##

print("$1:") while ('oiseau' =~ /\G([aeiou])/g);
o:i: