> Given that timing I suspect the trie optimization was not used.

Sure, see also ${^RE_TRIE_MAXBUF} in perlvar

       ${^RE_TRIE_MAXBUF}
               Controls how certain regex optimisations are applied an
+d how
               much memory they utilize. This value by default is 6553
+6 which
               corresponds to a 512kB temporary cache. Set this to a h
+igher
               value to trade memory for speed when matching large
               alternations. Set it to a lower value if you want the
               optimisations to be as conservative of memory as possib
+le but
               still occur, and set it to a negative value to prevent 
+the
               optimisation and conserve the most memory.  Under norma
+l
               situations this variable should be of no interest to yo
+u.

[download]

Disabling the buffer is also a mean to show the effect of a missing optimization.

It's also much faster to join all strings to be inspected on the LHS and to run the regex just once.

But if only word-boundaries are needed, I suppose hash-lookups can still be faster, of course depending on "density" and "distance" of the searched patterns.

Cheers Rolf

( addicted to the Perl Programming Language)

In reply to Re^3: Efficient matching with accompanying data (${^RE_TRIE_MAXBUF}) by LanX
in thread Efficient matching with accompanying data by Endless

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