2010/7/9 Georg Brandl <g.brandl at gmx.net>:
> Am 09.07.2010 02:35, schrieb MRAB:
>
>>
>> 1. Some of the inline flags are scoped; for example, putting "(?i)" at
>> the end of a regex will now have no effect because it's no longer a
>> global, all-or-nothing, flag.
>
> That is problematic. I've often seen people put these flags at the end
> of a regex, probably for readability purposes. IMHO it would be better
> to limit flag scoping to the explicit (?flags-flags: ) groups.
>
I just noticed the formulation on the reference page
regular-expressions.info on this kind of flags:
"(?i) Turn on case insensitivity for the remainder of the regular
expression. (Older regex flavors may turn it on for the entire
regex.)" and likewise for other flags.
http://www.regular-expressions.info/refadv.html
I am not sure, how "authoritative" this page by Jan Goyvaerts is for
various implementations, but it looks like a very comprehensive
reference.
I think with a new regex implementation, not all of this "historical"
semantics must be copied, unless there are major real usecases, which
would be affected by this.
Just a thought;
Vlastimil Brom
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