C# Multiple Word Replacement Issue

Question

Consider the case where I want every occurrence of the phrase "hello world" in an article to be replaced with "I love apple". How should I write the code to do the replacement?

I am aware that I could simply use Replace function to do the replacement but it is not the most ideal way to do so (if I specify to replace the word "or" it will also do the replacement for the word "for" etc). Is there any other way I can do to achieve what I want?

"How should I write the code to do the replacement?". What have you tried? Is this an issue you are actually facing (note the FAQ says: "You should only ask practical, answerable questions based on actual problems that you face."). — Oded, Jan 07 '13 at 13:38
What have you tried so far? Have you read anything about string search and replace in C#? I mean, it's a fairly well covered topic. No doubt google returns no less than a hundred page that cover it. — Pete, Jan 07 '13 at 13:38
possible duplicate of [How can I replace a specific word in C#?](http://stackoverflow.com/questions/884759/how-can-i-replace-a-specific-word-in-c) — Jon B, Jan 07 '13 at 13:43
@JonB: This question is slightly different. He wants to replace a word combination with another word combination without replacing parts of a word. So each string must be a whole word and the order matters (i assume). — Tim Schmelter, Jan 07 '13 at 13:50

score 1 · Answer 1 · edited May 23 '17 at 10:24

i think you can use regular expresion

using System;
using System.Text.RegularExpressions;
public class Test
{
   public static void Main()
   {
       string input = "doin some replacement";
       string pattern = @"\bhello world'\b";
       string replace = "I love apple";
       string result = Regex.Replace(input, pattern, replace);        
    }
}

following link might be helpful

Way to have String.Replace only hit "whole words"

semao · Accepted Answer · 2013-01-07T19:24:34.327

1

You can try using Regular Expressions with lookbehind:

String urstring = Regex.Replace(urstring,"(?<=\W)or|^or","SS")

This will replace all "or" occurrences that are NOT preceded by a letter or digit.

edited Jan 07 '13 at 19:24

answered Jan 07 '13 at 13:54

semao

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score 0 · Answer 3 · edited May 23 '17 at 11:47

0

Use Regular Expressions. This has already been covered, please consult the following:

edited May 23 '17 at 11:47

Community

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answered Jan 07 '13 at 13:45

Marcus

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score -1 · Answer 4 · edited May 23 '17 at 12:10

-1

Try using regex like in here:

How can I replace a specific word in C#?

or here:

How can I replace specific word in c# with parenthesis?

edited May 23 '17 at 12:10

Community

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answered Jan 07 '13 at 13:41

Alex

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That would fail if the word/phrase appears at the beginning or end of the string, or if it's followed by punctuation. – Jon B Jan 07 '13 at 13:42

C# Multiple Word Replacement Issue

4 Answers4