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Re: what is the difference between index and rindex

by gellyfish (Monsignor)
on Sep 05, 2006 at 09:52 UTC ( #571222=note: print w/replies, xml ) Need Help??


in reply to what is the difference between index and rindex

One starts searching at the beginning of the string and the other does the search in reverse, hence the 'r'

/J\

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Re^2: what is the difference between index and rindex
by bart (Canon) on Sep 06, 2006 at 07:56 UTC
    Hmm, I always thought the "r" stood for "right". As in BASIC (the functions Left$, Mid$, Right$ — Microsoft's DOS based QuickBASIC had them).

      What was really cool is that MID$ was an lvalue and, if I remember correctly, could be assigned a string of a different length from its present value, i.e., you could replace n characters in the middle of a string with m new characters. Before I discovered Perl, I used to think QBasic was *the* language for string manipulation and text-munging jobs. (Of course, these days lots of languages can do that stuff. But back then, Borland C++ was the hot new thing, and it didn't have *anything* like MID$.) ISTR that LEFT$ and RIGHT$ had these properties too, but MID$ was the most general and therefore the most useful.


      Sanity? Oh, yeah, I've got all kinds of sanity. In fact, I've developed whole new kinds of sanity. You can just call me "Mister Sanity". Why, I've got so much sanity it's driving me crazy.

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