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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 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
            2 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











            $endgroup$













              Your Answer





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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
                2 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
                2 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 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.
                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




                $begingroup$
                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
              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.
              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 48 mins 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 13 mins ago


























                          community wiki





                          J. M. is slightly pensive




























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