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Postings from February 2007
Just as a data point, the current regex engine does a block memory
comparison for an exact string if:
* the string and pattern have the same UTF8-ness, and
* the match is case-sensitive
but does character by character matching otherwise;
ie
fast:
"X" =~ /XYZ/;
"\x{100}" =~ /\x{100}\x{101}\x{102}/;
slow:
"\x{100}" =~ /XYZ/;
"X" =~ /\x{100}\x{101}\x{102}/;
"anything" =~ /anything/i;
(Arguably a patten should store both plain and utf8 versions of each
exact string for quicker matching.)
--
A walk of a thousand miles begins with a single step...
then continues for another 1,999,999 or so.