To clarify, errata v13 has this in the table for erratum 3.29 in the list of non-portables:
(?imsx-imsx:X)
X, as a non-capturing group with the
given flags. Note that the flags i,s,m,x
are valid, but appending :X to the flag is
not.
Java 7 only
I interpret this as meaning that only the so-called modifier-span notation (the : suffix) is disallowed, but not just plain (?x), but I wanted to be sure that was the correct interpretation.
On Wed, Jun 26, 2013 at 1:13 PM, Mike Beckerle
<mbeckerle.dfdl@gmail.com> wrote:
I wrote this complicated regex today and it works in Daffodil.
Question is this. Is the (?x) which turns on regex free-spacing mode, officially supported in DFDL?
You can see from below that it is VERY desirable that it works.....
<xs:simpleType name="frontMatterType">
<xs:annotation>
<xs:appinfo source="http://www.ogf.org/dfdl/">
<dfdl:simpleType lengthKind="pattern" terminator="%FF;">
<dfdl:property name="lengthPattern"><![CDATA[(?x) # regex free spacing mode
#
# match the front matter of the document
#
.{1,8192}? # up to 8K of front matter content
#
# front matter ends at the first message description page
#
(?= # lookahead (followed by but not including...)
\f # a formfeed character
(?> \s | \x08 ){1,100}? # whitespace or backspace (x08)
MESSAGE\ DESCRIPTION\r # this literal text
\s{1,100}? # up to 100 whitespaces
-{19}\r # exactly 19 hyphens and a CR
) # end lookahead
]]></dfdl:property>
</dfdl:simpleType>
</xs:appinfo>
</xs:annotation>
<xs:restriction base="xs:string" />
</xs:simpleType>
--
Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | www.tresys.com
--
Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | www.tresys.com