Leon wrote:
> 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?
Capturing and backreferences are needed.
Try
s/(\( \d+ of) \d+ \)/\1 789 )/;
Note a left a space out in the capturing,
so I could write \1 789, while \1789 would fail.
It's shorter than \{1}789 or {\1}789 (or however is the right syntax)
Hope it helps you,
Andrea
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