Leon wrote:
>
> I need members help on this :-
>
> I wish to substitute ALL the number 123 marked in red
> found within the brackets ( 123 of 123 ), of $a, into 789.
>
> The regexes must not substitute the 4 following match :-
> 123 )
> 123
> of 123 )
> 123 of 123 )
>
> Therefore, the regexes MUST ONLY substitute the red 123 found in
> ( 123 of 123 )
> i.e to change the above into :-
> ( 123 of 789 )
>
> how could this be done?
>
> $a = 'this is 123 ) which I do not wish to change, and there are
> many 123 so what must I do to to substitute ALL the second 123
> just before the closing bracket ... like this => ( 123 of 123 )
> and there are many 123 here too but to change the 123 here also
> ( 123 of 123 ) ... and there are many 123 here too and so on and
> so on !';
>
> All I know is this :-
> $a =~s/\s\d+\s\)/ 789 \)/g;
> which is not what I want because it also substitute -
> 123 )
s/(\([^)]*)123(\s*\))/${1}789$2/g;
> *** I read the book and it mention about \b which I take it
> as a border with a default value of a space.
No. \b has zero width unlike a space which has width.
> I just wonder whether I could assign the default border \b,
> if this could be done, then I think I know how to have a
> specific match of the above.
John
--
use Perl;
program
fulfillment
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