How can I match everything that is after the last occurrence of some char in a perl regular expression?

Question

For example, return the part of the string that is after the last x in axxxghdfx445 (should return 445).

Answer 1

the simplest way is not regular expression, but a simple split() and getting the last element.

$string="axxxghdfx445";
@s = split /x/ , $string;
print $s[-1];