Split string in two strings

I have the following string, now I want to splits it up in 2 different strings like show in below:

STR = ["van Donk","Gerritsen","kooijman","Verliefde","Floré","Pengel","aan de Wiel","van der Hoeven","Hop","Boer","van Ewijk"]

What i want to create is

STR1 =  ["van","","","","","","aan de","van der","","","van"]
STR2 =  ["Donk","Gerritsen","kooijman","Verliefde","Floré","Pengel","Wiel","Hoeven","Hop","Boer","Ewijk"]

Anyone who can help me?

[Walter Roberson]

Ummm... why? "van der Hoeven" is a complete surname. The surname is not "Hoeven" with "van der" being some kind of middle name. "van der Hoeven" should be sorted under v or V, not under H

[Stephen23]

"The surname is not "Hoeven" with "van der" being some kind of middle name."

The "van der" is not part of the main name, it is a tussenvoegsel:

https://en.wikipedia.org/wiki/Tussenvoegsel

which in Dutch is ignored when sorting, just like "von" and "zu" are ignored in German.

""van der Hoeven" should be sorted under v or V, not under H"

There are differing opinions on this:

https://www.van-diemen-de-jel.nl/Genea/Spelling.html

https://academia.stackexchange.com/questions/8870/how-should-van-names-be-ordered-in-a-bibliography

https://www.anzsi.org/wp-content/uploads/2019/05/indexer.2006.45.pdf

So the required sort order depends mostly on where your users are from.

Answer 1

[Stephen23]

str = ["van Donk","Gerritsen","kooijman","Verliefde","Floré","Pengel","aan de Wiel","van der Hoeven","Hop","Boer","van Ewijk"]

str = 1×11 string array
    "van Donk"    "Gerritsen"    "kooijman"    "Verliefde"    "Floré"    "Pengel"    "aan de Wiel"    "van der Hoeven"    "Hop"    "Boer"    "van Ewijk"

tkn = regexp(str,'^(\w+\s+)*(\w+)$','tokens','once');
tkn = vertcat(tkn{:});
st1 = strtrim(tkn(:,1))

st1 = 11×1 string array
    "van"
    ""
    ""
    ""
    ""
    ""
    "aan de"
    "van der"
    ""
    ""
    "van"

st2 = tkn(:,2)

st2 = 11×1 string array
    "Donk"
    "Gerritsen"
    "kooijman"
    "Verliefde"
    "Floré"
    "Pengel"
    "Wiel"
    "Hoeven"
    "Hop"
    "Boer"
    "Ewijk"

[Dion Theunissen]

Unfortunately this doesn't work for my whole string. Is there a way to only split on the last space? Cause i also have names like ["in 't veld"]

[Walter Roberson]

(.*)\s+(\S+)

What do you want to do if there are spaces after the last word?

[Stephen23]

str = ["van Donk","Gerritsen","kooijman","Verliefde","Floré","Pengel","aan de Wiel","van der Hoeven","Hop","Boer","van Ewijk","in 't veld"];
tkn = regexp(str,'^(.*?)\s*(\S+)$','tokens','once');
tkn = vertcat(tkn{:})

tkn = 12×2 string array
    "van"        "Donk"     
    ""           "Gerritsen"
    ""           "kooijman" 
    ""           "Verliefde"
    ""           "Floré"    
    ""           "Pengel"   
    "aan de"     "Wiel"     
    "van der"    "Hoeven"   
    ""           "Hop"      
    ""           "Boer"     
    "van"        "Ewijk"    
    "in 't"      "veld"