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 3 hours ago







      Kagaratsch

















      asked 3 hours ago









      KagaratschKagaratsch

      4,77631348




      4,77631348






















          3 Answers
          3






          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
            3 hours ago






          • 1




            $begingroup$
            Position[ToLowerCase[list], "abc"] also works.
            $endgroup$
            – C. E.
            2 hours 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









          $endgroup$





















            0












            $begingroup$

            Recall that StringMatchQ[] has the IgnoreCase option:



            Position[{1.234, a[2], {"Abc", 4/5}, "acb"},
            
         s_String /; StringMatchQ[s, "abc", IgnoreCase -> True]]
            
   {{3, 1}}





            share|improve this answer











            $endgroup$














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              3 Answers
              3






              active

              oldest

              votes








              3 Answers
              3






              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
                3 hours ago






              • 1




                $begingroup$
                Position[ToLowerCase[list], "abc"] also works.
                $endgroup$
                – C. E.
                2 hours 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
                3 hours ago






              • 1




                $begingroup$
                Position[ToLowerCase[list], "abc"] also works.
                $endgroup$
                – C. E.
                2 hours 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 3 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
                3 hours ago






              • 1




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




















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






              • 1




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


















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




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




              1




              1




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






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









                  MarcoBMarcoB

                  38.2k556114




                  38.2k556114























                      0












                      $begingroup$

                      Recall that StringMatchQ[] has the IgnoreCase option:



                      Position[{1.234, a[2], {"Abc", 4/5}, "acb"},
                      
         s_String /; StringMatchQ[s, "abc", IgnoreCase -> True]]
                      
   {{3, 1}}





                      share|improve this answer











                      $endgroup$


















                        0












                        $begingroup$

                        Recall that StringMatchQ[] has the IgnoreCase option:



                        Position[{1.234, a[2], {"Abc", 4/5}, "acb"},
                        
         s_String /; StringMatchQ[s, "abc", IgnoreCase -> True]]
                        
   {{3, 1}}





                        share|improve this answer











                        $endgroup$
















                          0












                          0








                          0





                          $begingroup$

                          Recall that StringMatchQ[] has the IgnoreCase option:



                          Position[{1.234, a[2], {"Abc", 4/5}, "acb"},
                          
         s_String /; StringMatchQ[s, "abc", IgnoreCase -> True]]
                          
   {{3, 1}}





                          share|improve this answer











                          $endgroup$



                          Recall that StringMatchQ[] has the IgnoreCase option:



                          Position[{1.234, a[2], {"Abc", 4/5}, "acb"},
                          
         s_String /; StringMatchQ[s, "abc", IgnoreCase -> True]]
                          
   {{3, 1}}






                          share|improve this answer














                          share|improve this answer



                          share|improve this answer








                          answered 44 mins ago


























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