How to split a text by words instead of .?! marks using Regex Split?

Question

I want to split a text by different words and not by periods. Here is a code I tried:

string StringFromTheInput = TextBox1.Text;
string[] splichar1 = Regex.Split(StringFromTheInput, @"(?<=[\because\and\now\this is])");

I want to use these words or phrases as delimiter in text instead of period mark, this is an example what output I need:

 Text: Sentence blah blah blahh because bblahhh balh and blahhh
 Output: because bblahhh balh and blahhh

 another example-

Text: bla now blahhh

Output: now blahhh

I want to split a text into sentences but instead of period mark [.] I want text parts to be seperated by some words, a normal text split would be this: Regex.Split(StringFromTheInput, @"(?<=[\.!?])"); but I want this Regex.Split(StringFromTheInput, @"(?<=[\because\and\now\this is])"); — user20465780
– user20465780, Commented Nov 14, 2022 at 20:17
Now I got this error: parsing "(?<=(if|and|but|so|when)" - Not enough )'s. — user20465780
– user20465780, Commented Nov 14, 2022 at 23:19
Yiyi You - partialy I applied only regular expresssions from your code cause I still need to use Regex.Split: heres is the code I used: string[] splichar1 = Regex.Split(StringFromTheInput, @"s(because|and|now|this is)\s"); this code whenever finds a word of these "because" "and" etc splits the part of a text but I want to split the text so that the splitted text involves the keywords "because" "and"' in the beginning of the splitted text -> for example because + splitted text; and + splitted text; I hope I could explain some... — user20465780
– user20465780, Commented Nov 18, 2022 at 6:39

Zakaria Najim · Accepted Answer · 2022-11-14 23:51:21Z

2

You can do it with String.Contains Method and String.Substring Method.

Code:

string stringfromtheinput = "Sentence blah blah blahh because bblahhh balh and blahhh";
String[] spearator = {
  "because",
  "and",
  "now",
  "this is"
};

foreach(string x in spearator) {
  if (stringfromtheinput.Contains(x)) {
    Console.WriteLine(stringfromtheinput.Substring(stringfromtheinput.LastIndexOf(x)));
  }
}

Output:

because bblahhh balh and blahhh
and blahhh

answered Nov 14, 2022 at 23:51

Zakaria Najim

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Comments

Yiyi You · Accepted Answer · 2022-11-15 07:29:38Z

1

You can try to find the position of \because\and\now\this is,and then use substring.

string StringFromTheInput = TextBox1.Text;
 string str="";
            var match = Regex.Match(s, @"\b(because|and|now|this is)\b");
            if (match.Success)
            {
                var index=match.Index; // 25
                str = s.Substring(index);//str is what you want
            }

Output:

because bblahhh balh and blahhh

answered Nov 15, 2022 at 7:29

Yiyi You

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1 Comment

user20465780 Over a year ago

Yiyi You - partialy I applied only regular expresssions from your code cause I still need to use Regex.Split: heres is the code I used: string[] splichar1 = Regex.Split(StringFromTheInput, @"\s(because|and|now|this is)\s"); this code whenever finds a word of these "because" "and" etc splits the part of a text but I want to split the text so that the splitted text involves the keywords "because" "and"' in the beginning of the splitted text -> for example because + splitted text; and + splitted text; I hope I could explain some..

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