Consider for example a string $str="xyabcyxyxyxyxy" and a string $chompstr="xy". I would like to produce a new string which as many copies of $chompstr chopped off at the end as possible - in the example case, the result would be "xyabcy". What would be a good way (in whatever measurement of the word "good") to solve this?

My first attempt was to use the following regexp:

$str =~ s/($chompstr)*\z//;
[download]

I used \z instead of $, because we might legally chomp something like "#\n". This works most of the time, but it does of course not work if $chompstr contains characters which have special meanings in a regexp. So I was thinking about the following possibilities:

• Do a local $/=$chompstr; and do a chop $str repeatedly, until the string "does not change" anymore.
• Test whether substr($str,-length($chompstr)) eq $chompstr). Chop off and repeat if it is.

Both solutions are certainly possible, but maybe there is an easier way to do it, or maybe someone knows a module which already offers this functionality...

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