Author: ph10 Date: To: pcunite CC: pcre-dev Subject: Re: [pcre-dev] Matching file contents as one string using
PCRE_DOTALL
On Fri, 10 May 2013, pcunite@??? wrote:
> *.txt ---------------------------> (?=.*\.txt$)
And one more thing: the most efficient pattern for "ends with .txt" is
.*(?<=\.txt)
The .* rushes to the end of the pattern; then there is a lookbehind to
check the last 4 characters. That's it. Your pattern will skip to the
end, then backtrack *all the way to the start*, trying to match \.txt$
at each position. Not optimal. (Pattern matchers can be quite dumb.)
