Split string with multiple separators in C#

Question

I am having trouble splitting a string in C# with a delimiters && and ||.

For example the string could look like:

"(abc)&&(rfd)&&(5)||(hh)&&(nn)||(iu)"

Code:

string[] value = arguments.Split(new string[] { "&&" }, StringSplitOptions.None);

I need to split or retrieve values in array without () braces - I need thte output to be

"abc" "rfd" "5" "nn" "iu"

and I need it in an array

Dictionary<string, string> dict = new Dictionary<string, string>();
            dict.Add("a", "value1");
            dict.Add("abc", "value2");
            dict.Add("5", "value3");
            dict.Add("rfd", "value4");
            dict.Add("nn", "value5");
            dict.Add("iu", "value6");

foreach (string s in strWithoutBrackets)
{
     foreach (string n in dict.Keys)
     {
          if (s == n)
          { 
               //if match then replace dictionary value with s
          }
      }
}

 ///Need output like this
 string outputStr = "(value1)&&(value2)&&(value3)||(value4)&&(value5)||(value6)";

You can write your own parser - or look into regular expressions. — Rob
– Rob, Commented Nov 8, 2017 at 5:31
@John - Why do you expect new string[] { "&&" } to remove || and ( and )? Isn't it then fairly obvious what you need to do? — Enigmativity
– Enigmativity, Commented Nov 8, 2017 at 5:39

sujith karivelil · Accepted Answer · 2019-07-17 13:37:00Z

7

You should try these:

string inputStr = "(abc)&&(rfd)&&(5)||(hh)&&(nn)||(iu)";
string[] strWithoutAndOR = inputStr.Split(new string[] { "&&","||" }, StringSplitOptions.RemoveEmptyEntries);
string[] strWithoutBrackets = inputStr.Split(new string[] { "&&","||","(",")" }, StringSplitOptions.RemoveEmptyEntries);

Check out this working Example

As per MSDN docs: String.Split Returns a string array that contains the substrings in this instance that are delimited by elements of a specified string or Unicode character array. The split method is having few overloaded methods, you can make use of String.Split Method (String[], StringSplitOptions) for this scenario, where you can specify the subStrings that you want to refer for the split operation. The StringSplitOptions.RemoveEmptyEntries will helps you to remove empty entries from the split result

edited Jul 17, 2019 at 13:37

answered Nov 8, 2017 at 5:33

sujith karivelil

29.1k7 gold badges60 silver badges90 bronze badges

Sign up to request clarification or add additional context in comments.

7 Comments

ND's Over a year ago

Dictionary<string, string> dict = new Dictionary<string, string>(); dict.Add("a", "value1"); dict.Add("abc", "value2"); dict.Add("5b", "value3"); dict.Add("hh", "value4"); dict.Add("nn", "value5"); dict.Add("iu", "value6");

sujith karivelil Over a year ago

@John: Well, have you checked my code, working example?

ND's Over a year ago

foreach (string s in strWithoutBrackets) { foreach (string n in dict.Keys) { if (s == n) { //if match then replace dictionary value with s } } } ///Need output like this string outputStr = "(value1)&&(value2)&&(value3)||(value4)&&(value5)||(value6)";

ND's Over a year ago

thanks lucky it works i just want to match arrary value with dictionary and make a new string please check updated question

sujith karivelil Over a year ago

Probably that would be a different question. anyway what's wrong with that

|

heijp06 · Accepted Answer · 2017-11-08 09:20:34Z

If I understand your question correctly, you have a string like this:

"(abc)&&(rfd)&&(5)||(hh)&&(nn)||(iu)"

and want output like this:

"(value1)&&(value2)&&(value3)||(value4)&&(value5)||(value6)"

Where each of the value* values is found by looking up a matched string (for instance "abc") in a dictionary you supply.

If that is the case you can use a regular expression with a MatchEvaluator that does the dictionary lookup.

class Program
{
    private static Dictionary<string, string> _dict = new Dictionary<string, string>
    {
        {"a", "value1"},
        {"abc", "value2"},
        {"5", "value3"},
        {"rfd", "value4"},
        {"nn", "value5"},
        {"iu", "value6"}
    };

    private static void Main(string[] args)
    {
        string input = "(abc)&&(rfd)&&(5)||(hh)&&(nn)||(iu)";

        string output = Regex.Replace(input, @"(?<=\()\w+(?=\))", Lookup);

        Console.WriteLine(output);
    }

    private static string Lookup(Match m)
    {
        string result;
        _dict.TryGetValue(m.Value, out result);
        return result;
    }
}

The regex (?<=\()\w+(?=\)) matches a non zero length string consisting of upper or lower cases letters, the underscore or digits: \w+, a look behind assertion for the opening parenthesis (?<=\() and a look ahead assertion for the closing parenthesis (?=\)).

Note that one of the strings that is matched in the input string "hh" is not in the dictionary you supply. I have chosen to return null in that case, you might want to throw an exception or handle such an error in another way.

In simple cases, the MatchEvaluator can be replaced by a lambda expression.

Mehul Prajapati · Accepted Answer · 2017-11-08 08:00:39Z

-3

You should try this code :

string value = "(abc)&&(rfd)&&(5)||(hh)&&(nn)||(iu)";
string[] splitVal = value.Split(new string[] { "&&", "||" },StringSplitOptions.None);

edited Nov 8, 2017 at 8:00

answered Nov 8, 2017 at 5:47

Mehul Prajapati

331 silver badge11 bronze badges

3 Comments

Enigmativity Over a year ago

It doesn't do what the OP wants. And why have you got the string[] a = splitVal;;?

Mehul Prajapati Over a year ago

string[] a is just for testing purpose. now it's correct.

Enigmativity Over a year ago

Your answer still doesn't do what the OP wants.

Collectives™ on Stack Overflow

Split string with multiple separators in C#

3 Answers 3

7 Comments

Comments

3 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

7 Comments

Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related