https://bugs.exim.org/show_bug.cgi?id=2683
Giuseppe D'Angelo <dangelog@???> changed:
What |Removed |Added
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CC| |dangelog@???
--- Comment #1 from Giuseppe D'Angelo <dangelog@???> ---
> Is pcretest not trying a last match attempt there an issue with pcretest or is this according to perl and not an issue?
This is Perl:
$ perl -mre=debug -E '$_ = "."; while (/a?a?/g) { say "match from $-[0] to
$+[0]" }'
Compiling REx "a?a?"
Final program:
1: CURLY{0,1} (5)
3: EXACT <a> (0)
5: CURLY{0,1} (9)
7: EXACT <a> (0)
9: END (0)
minlen 0
Matching REx "a?a?" against "."
0 <> <.> | 0| 1:CURLY{0,1}(5)
| 0| EXACT <a> can match 0 times out of 1...
0 <> <.> | 1| 5:CURLY{0,1}(9)
| 1| EXACT <a> can match 0 times out of 1...
0 <> <.> | 2| 9:END(0)
Match successful!
match from 0 to 0
Matching REx "a?a?" against "."
0 <> <.> | 0| 1:CURLY{0,1}(5)
| 0| EXACT <a> can match 0 times out of 1...
0 <> <.> | 1| 5:CURLY{0,1}(9)
| 1| EXACT <a> can match 0 times out of 1...
0 <> <.> | 2| 9:END(0)
Match possible, but length=0 is smaller than requested=1, failing!
| 1| failed...
| 0| failed...
1 <.> <> | 0| 1:CURLY{0,1}(5)
| 0| EXACT <a> can match 0 times out of 1...
1 <.> <> | 1| 5:CURLY{0,1}(9)
| 1| EXACT <a> can match 0 times out of 1...
1 <.> <> | 2| 9:END(0)
Match successful!
match from 1 to 1
Matching REx "a?a?" against ""
1 <.> <> | 0| 1:CURLY{0,1}(5)
| 0| EXACT <a> can match 0 times out of 1...
1 <.> <> | 1| 5:CURLY{0,1}(9)
| 1| EXACT <a> can match 0 times out of 1...
1 <.> <> | 2| 9:END(0)
Match possible, but length=0 is smaller than requested=1, failing!
| 1| failed...
| 0| failed...
Match failed
Freeing REx: "a?a?"
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