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<  Erlang  ~  splitting a string into 2 substring
l1bby
Posted: Wed Sep 10, 2008 12:12 am Reply with quote
Joined: 09 Sep 2008 Posts: 1
Hi All,

I am new to erlang and I want to write Erlang function that given a string and a pattern and uses the pattern to split the string into like this:

For example if the pattern is "ab" and the string is "acabcabts" the code will return ["ac", "cabts"].

If the pattern is "bc" and the string is "bcad" the code returns ["", ad].

If the pattern is "ac" and the string is "bcad" the code will return ["bcad", ""].

I'm trying to make function using reverse list but still stuck there. Can anybody help me? Thank's so much.
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dsmith
Posted: Wed Sep 10, 2008 10:43 pm Reply with quote
User Joined: 08 Aug 2007 Posts: 41 Location: Toronto
It may not be exactly what you are looking for but you could try the regexp module.


Code:

19> regexp:split("acabcabts", "ab"). 
{ok,["ac","c","ts"]}
20> regexp:split("bcad", "ad").     
{ok,["bc",[]]}
21> regexp:split("bcad", "ac").
{ok,["bcad"]}
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dsmith
Posted: Thu Sep 11, 2008 12:57 am Reply with quote
User Joined: 08 Aug 2007 Posts: 41 Location: Toronto
I wrote a little module that should do what you need. There are two exports split/2 and split_first/2.

It should a least get you started.

Code:

-module(string_misc).
-export([split_first/2,split/2]).

split(String, Delim) ->
    split(String ,Delim, []).

split([], _, ListAcc) ->
   lists:reverse(ListAcc);
split(String, Delim, ListAcc) ->
   [FirstPart, SecondPart] = split_first(String, Delim),
   split(SecondPart, Delim, [FirstPart|ListAcc]).

split_first(String, Delim) ->
    split_first(String, Delim, []).
   
split_first([], _, FirstPart) ->
   [lists:reverse(FirstPart), []];
split_first([H|T], [H|DT]=Delim, FirstPart) ->
   case split_match(T, DT) of
      no_match ->
         split_first(T, Delim, [H|FirstPart]);
      Rest ->
         [lists:reverse(FirstPart), Rest]
   end;
split_first([H|T], Delim, PartAcc) ->
   split_first(T, Delim, [H|PartAcc]).

split_match(String, []) ->
   String;
split_match([H|T], [H|DT]) ->
   split_match(T, DT);
split_match(_, _) ->
    no_match.


Code:

177> string_misc:split_first("acabcabts","ab").         
["ac","cabts"]
178> string_misc:split_first("bcad","bc").     
[[],"ad"]
179> string_misc:split_first("bcad","ac").     
["bcad",[]]
180> string_misc:split("acabcabts","ab").     
["ac","c","ts"]
181> string_misc:split("bcad","bc").     
[[],"ad"]
182> string_misc:split("bcad","ac").     
["bcad"]
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wuji
Posted: Mon Aug 13, 2012 6:55 am Reply with quote
User Joined: 10 Aug 2012 Posts: 654
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User Joined: 19 Sep 2012 Posts: 236
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