The regexes do a lot of backtracking and stuff.

Which one? I don't see anywhere that backtracking could occur. Everything there's a choice, only one path can possibly match. 

   $query =~ s{
              (?<![\w.+-])
              [+-]?
              (?:
                \d+
                (?:[.]\d*)?
                |[.]\d+
              )
              (?:e[+-]?\d+)?
              \b
             }
             {N}gx;                             # Float/real into N

[download]

The trailing \b is buggy. 

"12345 "  -> "N "
"12345. " -> "N. "

[download]

It matched "12345." until the "\b" was reached, then it backtracked to release the "." from the match. Oops, I guess there is backtracking, but only because of the bug.

In reply to Re: In search of an efficient query abstractor by ikegami
in thread In search of an efficient query abstractor by xaprb

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