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  DB<123> $str = join "","a".."j"
 => "abcdefghij"
...
match 10 j 
 => ""

       "(?{ code })"
                 WARNING: This extended regular expression feature is
                 considered experimental, and may be changed without n
+otice.
                 Code executed that has side effects may not perform
                 identically from version to version due to the effect
+ of
                 future optimisations in the regex engine.