Re: Extract string from rear of string

You can use rindex to find the index of the rightmost character of string, which you could then modify with substr, but what you really want is File::Basename, it's part of the standard distribution.

update: Indeed, Aigherach is right about the the fact that rindex takes a substring, but that is not germane to the discussion. If you're trying to identify the extension, that probably means you're looking for the rightmost dot in a string.

substr( $s, 0, rindex( $s, '.' )); # the part before the dot
substr( $s, rindex( $s, '.' ) + 1); # the part after the dot
[download]

But that has portability considerations, and as such is dealt with by fileparse from the File::Basename module.

`g r i n d e r just another bofh print@_{sort keys %_},$/if%_=split//,'= & *a?b:e\f/h^h!j+n,o@o;r$s-t%t#u';`

Comment on Re: Extract string from rear of string Download Code

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Re: Re: Extract string from rear of string by Aighearach (Initiate) on Dec 28, 2001 at 02:46 UTC
Actually, it returns the position of the rightmost occurrence of a substring rather than a character. Though, you could use it to check for a substring that is only one character. rindex STR,SUBSTR,POSITION rindex STR,SUBSTR Works just like index() except that it returns the position of the LAST occurrence of SUBSTR in STR. If POSITION is specified, returns the last occur rence at or before that position. -- Snazzy tagline here	[reply]
Re: Re: Extract string from rear of string by Anonymous Monk on Dec 28, 2001 at 06:34 UTC
or `$ext = (split /\./, $fname)[-1];` [download] But neither take note of the fact that the file might not have an extention...	[reply] [d/l]
Re: Extract string from rear of string by hacker (Priest) on Dec 28, 2001 at 15:20 UTC
..or more than one dot... like `linux-2.4.17.tar.gz`	[reply] [d/l]
(ichimunki) Re x 4: Extract string from rear of string by ichimunki (Priest) on Dec 28, 2001 at 22:49 UTC
Begging your pardon, but the split shown returns the last bit of stuff after the final dot, which I think complies with the rather vague request of getting the extension. In your example, the extension is 'gz' after all. That's the beauty of negative indices, they work from the other end.	[reply]