lkml.org 
[lkml]   [1997]   [Feb]   [12]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
FromMark Orr <>
SubjectRe: sh-utils expr 1.15 regexp bug
DateWed, 12 Feb 1997 05:13:49 -0600
Noah Friedman wrote:
> 
> It used to be the case that the expression
> 
>     expr 100 : '0$\|-?[1-9][0-9]*'
> 
> Would print 3.  This worked with sh-utils 1.12.
> 
> With 1.15, it prints 0 unless I remove "-?" from the regexp, or replace it
> with `*', which isn't exactly right.
> 
> Isn't `?' a part of the old grep syntax for matching the preceding
> character or group 0 or 1 times?  Was this functionality removed
> deliberately?  It's breaking the linux kernel configuration scripts.

I've experienced this too...It affects two lines in Menuconfig only. 
The
reply given me by the maintainer of sh-utils was to  add a "\" before
the ?  as suggested in the other reply to your post.

There are two such functions in Menuconfig -- one to accept decimal
values, and one to accept hexadecimal values.   Also look at a line 30
or so lines beyond that one that reads:

           if expr $answer : '[0-9a-fA-F]+$' >/dev/null 

add a "\" before the plus sign ("+") to this one.

This affects the Menuconfig in all linux kernel version so far.

I've sent mail to the linux-kernel mailing list...but it went unnoticed
there.

---
Mark Orr
markorr@intersurf.com
\
 
 \ /
  Last update: 2005-03-22 12:38    [from the cache]
©2003-2008