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Re: removing substring from string array [message #53336 is a reply to message #53240]

Mon, 02 April 2007 14:38

JD Smith
Messages: 850
Registered: December 1999

Senior Member

On Mon, 02 Apr 2007 14:21:42 -0700, rchughes wrote:

> Hi All,
>
> Does anyone know a quick way to remove the same prefix from all
> elements in a string array?
>
> Here is an example:
> start with string_array = ['dog.spot', 'dog.rover', 'dog.lucky']
>
> and get ['spot', 'rover', 'lucky']
>
> The only way I know I can do this is with a FOR loop and the
> STRSPLIT(string_array[i], '.', /EXTRACT) command. I am hoping someone
> could help me out with a much more efficient way if there is one.

For a fixed length string like this, it's easy:

print,strmid(string_array,4)

But, suppose it's a non-uniform length string:

string_array = ['dog.spot','cat.betsy','doggy.rover','parrot.bill','dog.luc ky']
p=strpos(string_array,'.')
print,strmid(string_array,1#p+1)

Notice that silly use of 1#p. This is to ensure that only 1
sub-string is extracted from each string in the array (try it without
the 1# and you'll see what I mean; see STRMID docs).

Or you could even be more general and use a regular expression:

string_array = ['dog.spot','cat*betsy','doggy#rover','parrot&bill','dog @lucky']
p=stregex(string_array,'^.+[.*#&@]',LENGTH=len)
print,strmid(string_array,1#len)

JD

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[Message index]

		removing substring from string array By: rchughes on Mon, 02 April 2007 14:21
		Re: removing substring from string array By: Ryan. on Tue, 03 April 2007 07:51
		Re: removing substring from string array By: David Fanning on Tue, 03 April 2007 08:28
		Re: removing substring from string array By: Ryan. on Tue, 03 April 2007 06:50
		Re: removing substring from string array By: Ryan. on Tue, 03 April 2007 06:21
		Re: removing substring from string array By: Jean H. on Mon, 02 April 2007 14:40
		Re: removing substring from string array By: Jean H. on Mon, 02 April 2007 14:44
		Re: removing substring from string array By: yp on Mon, 02 April 2007 14:54
		Re: removing substring from string array By: JD Smith on Mon, 02 April 2007 14:38

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