problem with '^' as first char in BRE for expr

[Bob McGowan]

>From the expr man page:

 :      Perform  pattern  matching.   Its   arguments   are
        coerced to strings and the second one is considered
        to be a regular expression, with a  `^'  implicitly  <
        added at the beginning.  The first argument is then  <
        matched against this regular  expression.   If  the
        match  succeeds  and part of the string is enclosed
        in `\(' and `\)', that part is the value of  the  :
        expression; otherwise an integer whose value is the
        number of characters matched is returned.   If  the
        match fails, the : operator returns the null string
        if `\(' and `\)' are used, otherwise 0.   Only  one
        `\(' and `\)' pair can be used.

Helmut Dipper wrote:
> 
> I use bash and fileutils from the latest distribution
> on Windows-NT 4.0 SP5.
> 
> expr 'abc' : '^a\(.\)c$'
> delivers:
> expr: warning: unportable BRE: `^a\(.\)c$': using `^' as the first
> character
> of the basic regular expression is not portable; it is being ignored
> 
> Question:
> I think the character '^' in a BRE is not irrelevant,
> why is it ignored?
> 
> Regards
> Helmut Dipper
> 
> --
> Helmut Dipper                   | SICAD Utilities GmbH
> phone: +49 89 636 41558 | Otto-Hahn-Ring 6
> ___fax: +49 89 636 49613 | D-81730 Muenchen
> 
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-- 
Bob McGowan
Staff Software Quality Engineer
VERITAS Software
rmcgowan@veritas.com

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