Removing words from text with separators in front(using regex or list)

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I need to remove words from the text with separators next to them. The problem is that the program only removes 1 separator after the word but there are many of them. Any suggestions how to remove other separators? Also, I need to make sure that the word is not connected with other letters. For example (If the word is fHouse or Housef it should not be removed)

At the moment I have:

What I have tried:

C#

public static void Process(string fin, string fout)
        {
            using (var foutv = File.CreateText(fout)) //fout - OutPut.txt
            {
                using (StreamReader reader = new StreamReader(fin)) // fin - InPut.txt
                {
                    string line;
                    while ((line = reader.ReadLine()) != null)
                    {
                        string[] WordsToRemove = { "Home", "House", "Room" };
                        char[] seperators = {';', ' ', '.', ',', '!', '?', ':'};
                        foreach(string word in WordsToRemove)
                        {
                            foreach (char seperator in seperators)
                            {
                                line = line.Replace(word + seperator, string.Empty);
                            }
                        }
                        foutv.WriteLine(line);
                    }
                }
            }
        }

I have :
;;;;;;;;;;,,,,,,,,,, fhgkHouse!House!Dog;;;!!Inside!C!Room!Home!House!Room;;;;;;;;;;!Table!London!Computer!Room;..;

Results I get:
;;;;;;;;;;,,,,,,,,,, fhgkDog;;;!!Inside!C!;;;;;;;;;!Table!London!Computer!..;

The results should be:
fhgkHouse!Dog;;;!!Inside!C!Table!London!Computer!

Posted 21-Nov-22 13:45pm

MrDomke

Updated 21-Nov-22 15:42pm

PIEBALDconsult

v2

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Comments

PIEBALDconsult 21-Nov-22 21:43pm

I'd use a Regular Expression.

Graeme_Grant 22-Nov-22 0:57am

Added a regex version just for you! ❤️

1 solution

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Graeme_Grant · Answer 1 · 2022-11-21T15:10:00

Here is a working solution:
1. Trim unwanted leading characters
2. remove unwanted words
3. remove unwanted characters trailing unwanted words

C#

using System.Text;

string file = "data.txt";

string[] wordsToRemove = { "Home", "House", "Room" };
char[] seperators = {';', ' ', '.', ',', '!', '?', ':'}; 

string rawText = File.ReadAllText(file);

bool isCapturing = false;
bool isTrimming = false;
int start = -1;

StringBuilder sb = new();

for (int i = 0; i < rawText.Length; i++)
{
    if (start == -1 && char.IsLetterOrDigit(rawText[i]))
    {
        isCapturing = true; // stripping lead junk...
        isTrimming = false;
        start = i;
    }

    if (start == -1 && isCapturing)
    {
        if (isTrimming && rawText[i].Equals('!'))
        {
            isTrimming = false;
            continue;
        }

        if (!isTrimming)
            sb.Append(rawText[i]);
    }

    // tracking a word...
    if (start > -1 && seperators.Contains(rawText[i]))
    {
        if (!wordsToRemove.Any(x => x
                .Equals(rawText.Substring(start, i - start),
                    StringComparison.InvariantCultureIgnoreCase)))

            sb.Append(rawText.Substring(start, i - start + 1));
        else
            isTrimming = true; // trim unwanted characters

        start = -1;
    }
}

Console.WriteLine(sb);

Output:

fhgkHouse!Dog;;;!!Inside!C!Table!London!Computer!

UPDATE

@PIEBALDconsult, Here is a regex version just for you...

C#

string file = "data.txt";

string[] wordsToRemove = { "Home", "House", "Room" };

string rawText = File.ReadAllText(file);

string pattern = $"^.*?(?=[a-z])|(?<![a-z])((?=(?:{string.Join("|", wordsToRemove)}))(.*?)(?:\\!|\\z))";

string result = Regex.Replace(rawText, pattern, "", RegexOptions.IgnoreCase);

Console.WriteLine(result);