[BusyBox] expr: use POSIX regex [PATCH]

[Rainer Weikusat]

Shaun Jackman <sjackman at gmail.com> writes:
> On Apr 5, 2005 10:15 AM, Rob Landley <rob at landley.net> wrote:
>> On Tuesday 05 April 2005 01:48 pm, Shaun Jackman wrote:
>> > This patch modfies expr to use portable POSIX regex rather than BSD regex.
>> 
>> Sounds cool.  Is there a functional difference, or is this just syntax?  (I
>> suspect that in uclibc both are wrappers over the same functionality, but
>> haven't confirmed it.)
>> 
>> I just checked, and sed.c is using the posix regex already...
>> 
>> Rob
>
> I believe it's primarily a syntax difference. I just noticed though
> that expr match behaves as if it has an implicit ^ before the regex,
> i.e. it's an anchored regex.

That's what it's supposed to be according to POSIX.