On Fri, 20 Aug 2010, ND wrote:
> Subject: aa<CR><LF>b
> Pattern: a$
> Match: RegEx error - PCRE_ERROR_NOMATCH
>
> If
> Pattern: aa$
> then
> Match: aa
>
> Why 'PCRE_ERROR_NOMATCH' in first example?
When I test, I get NOMATCH in the second example as well.
You don't say what options you used, if any. You need
(1) PCRE_MULTILINE to tell PCRE that the subject is more than one line.
(2) PCRE_NEWLINE_CRLF or PCRE_ANYCRLF or PCRE_ANY so that <CR><LF> is
interpreted as a newline sequence. Testing with pcretest shows that this
works:
PCRE version 8.10 2010-06-25
/a$/m<crlf>
aa\r\nb
0: a
It also works if the pattern is aa$.
This is what the documentation says:
PCRE_MULTILINE
By default, PCRE treats the subject string as consisting of a single
line of characters (even if it actually contains newlines). The "start
of line" metacharacter (^) matches only at the start of the string,
while the "end of line" metacharacter ($) matches only at the end of
the string, or before a terminating newline (unless PCRE_DOLLAR_ENDONLY
is set). This is the same as Perl.
When PCRE_MULTILINE it is set, the "start of line" and "end of line"
constructs match immediately following or immediately before internal
newlines in the subject string, respectively, as well as at the very
start and end.
Philip
--
Philip Hazel
