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http://bugs.exim.org/show_bug.cgi?id=617
Summary: Several questions
Product: PCRE
Version: N/A
Platform: x86
OS/Version: Linux
Status: NEW
Severity: bug
Priority: low
Component: Code
AssignedTo: ph10@???
ReportedBy: felipensp@???
CC: pcre-dev@???
Hi, have several questions... Maybe don't be bug, but information don't
documented. I think.
* Using PCRE version 7.4 2007-09-21.
See below:
re> /(a(?1))/
data> aa
No match
re> /(a(?-1))/
data> aa
No match
Shouldn't it show error message as "Failed: reference to non-existent
subpattern"?
Who's referenced by (?-1)?
--------------------------------------------------------
In this case:
re> /(?(DEFINE)(?<a>\d+)(?<b>[a-z](?1)))(?&b)/
data> 1a1
0: a1
1: <unset>
2: <unset>
re> /(?(DEFINE)(?<a>\d+)(?<b>[a-z](?-1)))(?&b)/
data> 1a1
No match
re> /(?(DEFINE)(?<a>\d+)(?<b>[a-z](?-1)))(?&b)/
data> 1aa
No match
re> /(?(DEFINE)(?<a>\d+)(?<b>[a-z](?-2)))(?&b)/
data> 1a1
0: a1
1: <unset>
2: <unset>
Who's referenced by (?-1) ?
-----------------------------------------------------
re> /(?(DEFINE)(?<a>\d+)(?<b>[a-z](?-1)))(?&)/
data> 1a1
0: 1
1: <unset>
(?&) references first named grouping? This is documented?
-----------------------------------------------------
re> /(?){0}/
Failed: nothing to repeat at offset 5
Nothing to repeat not even nonce?
------------------------------------------------------
re> /(?:?)/
Failed: nothing to repeat at offset 3
re> /(?<a>?)/
Failed: nothing to repeat at offset 5
But /(?)/ is accepted.
Regards,
Felipe.
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