Find non-case sensitive string in a mixed list of elements? The Next CEO of Stack...

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Find non-case sensitive string in a mixed list of elements?



The Next CEO of Stack OverflowBuilding a list recursive with one or more argumentsReturn Functions from parallel execution of moduleFast method to select matrix elements based on a vector of positionsIssue with very large lists in MathematicaFaster position list construction from a “take instructions” listConvert elements of list to stringAdding a collection of neighbors to points in a list, concatenating strings, parallelization/optimizing run-time?Get sublists by pattern?Obtaining the position in a list where the i^th element is bigger than the (i+1)^th elementExtract all instances of variables matching a pattern?












2












$begingroup$


Consider an example list with mixed element types, e.g.:



list = { 1.234 , a[2] , {"Abc" , 4/5} , "acb" };


I would like to have a function that finds the position of a string, without regard to upper or lower characters, e.g.:



findPosition[list,"abc"]



{{3,1}}




Is there a function like that in Mathematica? Or maybe one can implement it with efficient performance?



EDIT:



My current workaround is:



findPosition[list_,str_]:=Position[list/.x_String:>ToLowerCase[x],ToLowerCase[str]]





list-manipulation function-construction searching







share|improve this question











$endgroup$

















    2












    $begingroup$


    Consider an example list with mixed element types, e.g.:



    list = { 1.234 , a[2] , {"Abc" , 4/5} , "acb" };


    I would like to have a function that finds the position of a string, without regard to upper or lower characters, e.g.:



    findPosition[list,"abc"]



    {{3,1}}




    Is there a function like that in Mathematica? Or maybe one can implement it with efficient performance?



    EDIT:



    My current workaround is:



    findPosition[list_,str_]:=Position[list/.x_String:>ToLowerCase[x],ToLowerCase[str]]





    list-manipulation function-construction searching







    share|improve this question











    $endgroup$















      2












      2








      2





      $begingroup$


      Consider an example list with mixed element types, e.g.:



      list = { 1.234 , a[2] , {"Abc" , 4/5} , "acb" };


      I would like to have a function that finds the position of a string, without regard to upper or lower characters, e.g.:



      findPosition[list,"abc"]



      {{3,1}}




      Is there a function like that in Mathematica? Or maybe one can implement it with efficient performance?



      EDIT:



      My current workaround is:



      findPosition[list_,str_]:=Position[list/.x_String:>ToLowerCase[x],ToLowerCase[str]]





      list-manipulation function-construction searching







      share|improve this question











      $endgroup$




      Consider an example list with mixed element types, e.g.:



      list = { 1.234 , a[2] , {"Abc" , 4/5} , "acb" };


      I would like to have a function that finds the position of a string, without regard to upper or lower characters, e.g.:



      findPosition[list,"abc"]



      {{3,1}}




      Is there a function like that in Mathematica? Or maybe one can implement it with efficient performance?



      EDIT:



      My current workaround is:



      findPosition[list_,str_]:=Position[list/.x_String:>ToLowerCase[x],ToLowerCase[str]]





      list-manipulation function-construction searching




      list-manipulation function-construction searching






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 2 hours ago







      Kagaratsch

















      asked 2 hours ago









      KagaratschKagaratsch

      4,77631348




      4,77631348






















          2 Answers
          2






          active

          oldest

          votes


















          2












          $begingroup$

          Position[list, s_String /; ToLowerCase[s] == "abc"]



          {{3, 1}}




          or



          Position[list, s_String?(EqualTo["abc"]@*ToLowerCase)]





          share|improve this answer









          $endgroup$













          • $begingroup$
            I like how this does not need to make substitutions in list itself to search it!
            $endgroup$
            – Kagaratsch
            2 hours ago






          • 1




            $begingroup$
            Position[ToLowerCase[list], "abc"] also works.
            $endgroup$
            – C. E.
            1 hour ago





















          1












          $begingroup$

          Note that ToLowerCase does not evaluate if the input is not a string, but it is Listable, so it will thread over your list:



          list = {1.234, a[2], {"Abc", 4/5}, "acb"};
          
ToLowerCase[list]
          

          
(* Out: {ToLowerCase[1.234], ToLowerCase[a[2]], {"abc", ToLowerCase[4/5]}, "acb"} *)


          That should not bother you though; it certainly does not bother Position:



          Position[ToLowerCase[list], "abc"]
          
(* Out: {{3, 1}} *)





          share|improve this answer









          $endgroup$














            Your Answer





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            2 Answers
            2






            active

            oldest

            votes








            2 Answers
            2






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            2












            $begingroup$

            Position[list, s_String /; ToLowerCase[s] == "abc"]



            {{3, 1}}




            or



            Position[list, s_String?(EqualTo["abc"]@*ToLowerCase)]





            share|improve this answer









            $endgroup$













            • $begingroup$
              I like how this does not need to make substitutions in list itself to search it!
              $endgroup$
              – Kagaratsch
              2 hours ago






            • 1




              $begingroup$
              Position[ToLowerCase[list], "abc"] also works.
              $endgroup$
              – C. E.
              1 hour ago


















            2












            $begingroup$

            Position[list, s_String /; ToLowerCase[s] == "abc"]



            {{3, 1}}




            or



            Position[list, s_String?(EqualTo["abc"]@*ToLowerCase)]





            share|improve this answer









            $endgroup$













            • $begingroup$
              I like how this does not need to make substitutions in list itself to search it!
              $endgroup$
              – Kagaratsch
              2 hours ago






            • 1




              $begingroup$
              Position[ToLowerCase[list], "abc"] also works.
              $endgroup$
              – C. E.
              1 hour ago
















            2












            2








            2





            $begingroup$

            Position[list, s_String /; ToLowerCase[s] == "abc"]



            {{3, 1}}




            or



            Position[list, s_String?(EqualTo["abc"]@*ToLowerCase)]





            share|improve this answer









            $endgroup$



            Position[list, s_String /; ToLowerCase[s] == "abc"]



            {{3, 1}}




            or



            Position[list, s_String?(EqualTo["abc"]@*ToLowerCase)]






            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered 2 hours ago









            Henrik SchumacherHenrik Schumacher

            58.6k581162




            58.6k581162












            • $begingroup$
              I like how this does not need to make substitutions in list itself to search it!
              $endgroup$
              – Kagaratsch
              2 hours ago






            • 1




              $begingroup$
              Position[ToLowerCase[list], "abc"] also works.
              $endgroup$
              – C. E.
              1 hour ago




















            • $begingroup$
              I like how this does not need to make substitutions in list itself to search it!
              $endgroup$
              – Kagaratsch
              2 hours ago






            • 1




              $begingroup$
              Position[ToLowerCase[list], "abc"] also works.
              $endgroup$
              – C. E.
              1 hour ago


















            $begingroup$
            I like how this does not need to make substitutions in list itself to search it!
            $endgroup$
            – Kagaratsch
            2 hours ago




            $begingroup$
            I like how this does not need to make substitutions in list itself to search it!
            $endgroup$
            – Kagaratsch
            2 hours ago




            1




            1




            $begingroup$
            Position[ToLowerCase[list], "abc"] also works.
            $endgroup$
            – C. E.
            1 hour ago






            $begingroup$
            Position[ToLowerCase[list], "abc"] also works.
            $endgroup$
            – C. E.
            1 hour ago













            1












            $begingroup$

            Note that ToLowerCase does not evaluate if the input is not a string, but it is Listable, so it will thread over your list:



            list = {1.234, a[2], {"Abc", 4/5}, "acb"};
            
ToLowerCase[list]
            

            
(* Out: {ToLowerCase[1.234], ToLowerCase[a[2]], {"abc", ToLowerCase[4/5]}, "acb"} *)


            That should not bother you though; it certainly does not bother Position:



            Position[ToLowerCase[list], "abc"]
            
(* Out: {{3, 1}} *)





            share|improve this answer









            $endgroup$


















              1












              $begingroup$

              Note that ToLowerCase does not evaluate if the input is not a string, but it is Listable, so it will thread over your list:



              list = {1.234, a[2], {"Abc", 4/5}, "acb"};
              
ToLowerCase[list]
              

              
(* Out: {ToLowerCase[1.234], ToLowerCase[a[2]], {"abc", ToLowerCase[4/5]}, "acb"} *)


              That should not bother you though; it certainly does not bother Position:



              Position[ToLowerCase[list], "abc"]
              
(* Out: {{3, 1}} *)





              share|improve this answer









              $endgroup$
















                1












                1








                1





                $begingroup$

                Note that ToLowerCase does not evaluate if the input is not a string, but it is Listable, so it will thread over your list:



                list = {1.234, a[2], {"Abc", 4/5}, "acb"};
                
ToLowerCase[list]
                

                
(* Out: {ToLowerCase[1.234], ToLowerCase[a[2]], {"abc", ToLowerCase[4/5]}, "acb"} *)


                That should not bother you though; it certainly does not bother Position:



                Position[ToLowerCase[list], "abc"]
                
(* Out: {{3, 1}} *)





                share|improve this answer









                $endgroup$



                Note that ToLowerCase does not evaluate if the input is not a string, but it is Listable, so it will thread over your list:



                list = {1.234, a[2], {"Abc", 4/5}, "acb"};
                
ToLowerCase[list]
                

                
(* Out: {ToLowerCase[1.234], ToLowerCase[a[2]], {"abc", ToLowerCase[4/5]}, "acb"} *)


                That should not bother you though; it certainly does not bother Position:



                Position[ToLowerCase[list], "abc"]
                
(* Out: {{3, 1}} *)






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered 25 mins ago









                MarcoBMarcoB

                38.2k556114




                38.2k556114






























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