On Mon, 17 Jun 2019, ND via Pcre-dev wrote:
> PCRE2 version 10.33 2019-04-16
> /(?<=.{2}(?<=.{6}))/info
> Capture group count = 0
> Max lookbehind = 6
> May match empty string
> Subject length lower bound = 0
> abc\=ph
> No match
>
>
> Expected maxlookbehind=4, not 6.
Why do you expect 4? The matcher goes back 2, then matches two
characters, so it is back at the start. Then it goes back 6.
PCRE2 version 10.34-RC1 2019-04-22
re> /(?<=.{2}(?<=.{6}))/
------------------------------------------------------------------
0 29 Bra
3 23 AssertB
6 2 Reverse
9 Any{2}
13 10 AssertB
16 6 Reverse
19 Any{6}
23 10 Ket
26 23 Ket
29 29 Ket
32 End
------------------------------------------------------------------
Consider also:
PCRE2 version 10.34-RC1 2019-04-22
/(?<=a{2}(?<=[ab]{6}))(.*)/
bbbbaaXXX
0: XXX
1: XXX
cbbbaaXXX
No match
The successful match looked back 6 characters before XXX.
Philip
--
Philip Hazel
