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Does XBasic AT2() have a RAT2() function yet (backwards character search from position N) ?

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  • Does XBasic AT2() have a RAT2() function yet (backwards character search from position N) ?

    I probably asked this eight years ago, but thought I'd ask again...

    The AT2(C find_string ,C string [,N starting_position ]) XBasic function allows starting a forward search at a particular position in a string.

    There is no corresponding "RAT2()" function to search backwards in a string from a particular starting position, at least not in the version that I am on (Build 5581 V4.5.4.8).

    Are there any other XBasic functions, besides RAT(), that can search backwards through a string or has RAT2() been added to XBasic?

  • #2
    AT2 seems to work for me. Not sure what differentiates AT2 from AT except for the wording of what it does.
    I didn't see a RAT2, but oddly enough, AT and AT2 work with negative numbers.
    Gregg is a great site to test and share sql code


    • #3
      If you give AT2 a negative starting position, does it search backwards for you? If so, what version of Alpha is that? If AT2 were to search backwards in the code below, then I would expect the output of s.startPos to be 5.

      dim srch as c = ",a|1,b|2,c|3,"
      dim s as p
      s.endPos = at2("|2,", srch)
      s.startPos = at2(",", srch, 0 - s.endPos)
      ? S
      = endPos = 7
      startPos = 1


      • #4
        I’ll have to try it but to me that statement would return nothing because there are only 3 pipes in the string.
        Gregg is a great site to test and share sql code


        • #5
          OK. now that I understand the difference, primarily the integer in at2 is where in the string at2 will begin the search for the search string
          as opposed to the integer in the at() function representing the occurrence of the search string in the string.
          I tried AT2() using a negative integer, and while it did return a value, it was not the value I expected.

          I could be wrong, but depending on what you're trying to accomplish, I think the functions you
          need/wants are : occursi(), at(), rat(), and last but not least, A5_EXTRACT_ADVANCE() .

 is a great site to test and share sql code