Can you show an example of "matching consecutive zero-length strings"?

I can easily generate a random string with 

my $string = join q(), map +('a' .. 'z')[rand 26], 1 .. 10_000

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but I have no idea what regex(es) to try to match to play with it.

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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In reply to Re: Is there a way to allow consecutive zero-length matches without using pos()? by choroba
in thread Is there a way to allow consecutive zero-length matches without using pos()? by jsm

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