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

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

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

edited 3 hours ago

Kagaratsch

asked 3 hours ago

KagaratschKagaratsch

4,77631348

$endgroup$

add a comment | 

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

edited 3 hours ago

Kagaratsch

asked 3 hours ago

KagaratschKagaratsch

4,77631348

$endgroup$

add a comment | 

$begingroup$

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

edited 3 hours ago

Kagaratsch

asked 3 hours ago

KagaratschKagaratsch

4,77631348

$endgroup$

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

findPosition[list,"abc"]

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

share|improve this question

edited 3 hours ago

Kagaratsch

asked 3 hours ago

KagaratschKagaratsch

4,77631348

share|improve this question

edited 3 hours ago

Kagaratsch

asked 3 hours ago

KagaratschKagaratsch

4,77631348

asked 3 hours ago

KagaratschKagaratsch

4,77631348

asked 3 hours ago

KagaratschKagaratsch

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

answered 3 hours ago

Henrik SchumacherHenrik Schumacher

58.6k581162

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  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
  
  

  
  
  
  

add a comment | 

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

answered 54 mins ago

MarcoBMarcoB

38.2k556114

$endgroup$

add a comment | 

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

answered 19 mins ago

community wiki

J. M. is slightly pensive

$endgroup$

add a comment | 

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2

$begingroup$

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

3, 1

or

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

share|improve this answer

answered 3 hours ago

Henrik SchumacherHenrik Schumacher

58.6k581162

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  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
  
  

  
  
  
  

add a comment | 

2

$begingroup$

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

3, 1

or

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

share|improve this answer

answered 3 hours ago

Henrik SchumacherHenrik Schumacher

58.6k581162

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  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
  
  

  
  
  
  

add a comment | 

$begingroup$

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

3, 1

or

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

share|improve this answer

answered 3 hours ago

Henrik SchumacherHenrik Schumacher

58.6k581162

$endgroup$

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

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

share|improve this answer

answered 3 hours ago

Henrik SchumacherHenrik Schumacher

58.6k581162

answered 3 hours ago

Henrik SchumacherHenrik Schumacher

58.6k581162

answered 3 hours ago

Henrik SchumacherHenrik Schumacher

58.6k581162

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

answered 54 mins ago

MarcoBMarcoB

38.2k556114

$endgroup$

add a comment | 

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

answered 54 mins ago

MarcoBMarcoB

38.2k556114

$endgroup$

add a comment | 

$begingroup$

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

answered 54 mins ago

MarcoBMarcoB

38.2k556114

$endgroup$

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

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

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

share|improve this answer

answered 54 mins ago

MarcoBMarcoB

38.2k556114

answered 54 mins ago

MarcoBMarcoB

38.2k556114

answered 54 mins ago

MarcoBMarcoB

38.2k556114

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

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

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

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