On 2019-07-27 08:46, ph10 wrote:
For an anchored pattern, the "must be present" code unit value is set
only if it follows a variable length item in the pattern.
This is a judgement that it will probably be faster in most cases and it
will avoid the really bad case: suppose, instead of "abx" you have
abxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx...very long string without "c"
It can take a lot of time to search a long string (and in fact, for that
reason, there is a limit to how much is searched, even when there is a
value to search for). Much quicker to fail the match after just checking
the first three characters.
It's reasonable.
Thanks.
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