you might also want to have a look at redo and continue.
this "code" shows where next, redo and last jump, if continue is present:

 
while (EXPR) {
    REDO:
    #body of while block    
} continue {
    NEXT:
    #body of next block
}
LAST:
[download]

without continue it looks slightly different:

 
NEXT: while (EXPR) {
    REDO:
    # body of while block
}
LAST:
[download]

perls next, redo and last can also be used to get out of a deeper level of iteration:

# nb this is stupid code that shortens lines (a char at a time)
# and prints the result, until it finds a z at the first pos.

LINE: foreach(<>) {
    while(s/^.//) {
        print;
        last LINE if /^z/; #this also breaks the foreach loop. -- it j
+umps to the print "done"; statement
    }
}
print "done";
[download]