Re: String Index

[PhilipNienhuis]

Thomas D. Dean-2 wrote
> I have a string, 87 characters. containing pairs of parens enclosing 
> characters.  The number of chars enclosed is not constant.  There are 2 
> to 5 pairs of parens.  How do I construct the index to vectorize this?
> 
>  > n=numel(str)
> n =  87
>  > lp = [1:n](str == "(");
>  > rp = [1:n](str == ")");
>  > ## check to see if parens paired and lp < rp
>  > [lp', rp']
> ans =
>     38   47
>     54   57
>     66   73
>     85   87
> 
> I want to extract values from str using lp and rp
> 
>  > [ str(lp(1):rp(1));
>  >   str(lp(2):rp(2));
>  >   str(lp(3):rp(3));
>  >   str(lp(4):rp(4)) ]
> ans =
> (10^20 kg)
> (km)
> (kg/m^3)
> (1)

Read up on regexp()

Philip




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