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Re: String Spliting [message #49354 is a reply to message #49353]

Wed, 19 July 2006 12:49

mmiller3
Messages: 81
Registered: January 2002

Member

>>>> > ChristopherFlorio <ChristopherFlorio@gmail.com> writes:

> I am having a problem with the STRSPLIT function. I am
> using it to extract the file extension from a string where
> it might not be at the end. However in the process I am
> also eliminating addition elements, not found in the
> extension. For example

> file='Image.img' filter='*.img'

> file=STRJOIN(STRSPLIT(file,filter,/EXTRACT))

> file='Iae'

> desired output: file='Image'

The pattern argument to strsplit is either a single character, or
a regular expression. You are using '*.img' as a regular
expresion and therefore are splitting on any string that looks
like zero or more characters followed by i, m or g. If you want
to split in the '.', use '.' as your split: strsplit(file, '.',
/extract)

IDL> print, (strsplit('Image.img', '.', /extract))[0]
Image

If you want to strip off the extension, you can use strmid and
strpos. (Reverse_search is handy for gettign the last match,
rather than the first)

IDL> file='Image.img'
IDL> print, strmid(file, 0, strpos(file,'.', /reverse_search))
Image
IDL> file='Image.with.multiple.periods.img'
IDL> print, strmid(file, 0, strpos(file,'.'))
Image
IDL> print, strmid(file, 0, strpos(file,'.', /reverse_search))
Image.with.multiple.periods

Mike

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[Message index]

		Re: String Spliting By: Michael Galloy on Thu, 20 July 2006 06:37
		Re: String Spliting By: ChristopherFlorio on Thu, 20 July 2006 04:13
		Re: String Spliting By: Michael Galloy on Wed, 19 July 2006 13:03
		Re: String Spliting By: mmiller3 on Wed, 19 July 2006 12:49
		Re: String Spliting By: ChristopherFlorio on Wed, 19 July 2006 12:04
		Re: String Spliting By: JD Smith on Wed, 19 July 2006 10:39
		Re: String Spliting By: ChristopherFlorio on Wed, 19 July 2006 09:51
		Re: String Spliting By: Michael Galloy on Wed, 19 July 2006 08:06

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