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string evaluation in a long text

DavidLou

hello experts,

wondering if someone can help me out while I'm scratching my hair off. say I have a long text string like

   "blabla{a+b}{c}tada{d}..."

I want to replace the contents within {} (and remove {} as well) by evaluated values (if not evaluatable then replace by "?").

{} pair could be anywhere.

how can I use some skill code to do that?

thanks a lot,

David

  • VPrasad

    You can use rexCompile and rexReplace to meet your requirement.

    For Example :

                  we have a= "blabla{a+b}{c}tada{d}" then

                 rexCompile( "{[a-zA-Z0-9\\+]*}" )   => t

                 rexReplace( a "(*)" 0) => "blabla(*)(*)tada(*)"

  • DavidLou
    in reply to VPrasad

    thanks VPrasad,

    I could be not clear first hand. I'm looking to evaluate the expression within { } and replace them by the result, so not purely replace by fixed pattern. i.e., if a=1 and b=2, then I should replace {a+b} by 3. 

    is that possible?

    thanks,

    David

  • tweeksii
    in reply to DavidLou

    You bet!

    (defun CCSevalBracedExpressionInLongString (longString)
  (let ((pat (pcreCompile "{(.*)}" (pcreGenCompileOptBits ?ungreedy t))))
    (while (pcreExecute pat longString)
      (let ((value (errset (evalstring (pcreSubstitute "\\1")))))
        (setq longString (pcreReplace pat longString (if value (printself (car value)) "?") 1))))
    longString))

(let ((a 1)
      (b 2)
      (c "hello")
      (d 'unbound))
  (CCSevalBracedExpressionInLongString "blabla{a+b}{c}tada{d}"))
=> "blabla3\"hello\"tada?"

    Thanks for a fun one. Smile

  • DavidLou
    in reply to tweeksii

    OMG~~~~~~      YOU MADE IT!

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