Htykuut

For example I have code below
string txt="I have strings like West, and West; and west, and Western."

I would like to replace the word west or West with some other word. But I would like not to replace West in Western.

1. Can I use regular expression in string.replace? I used
   inputText.Replace("(\sWest.\s)",temp); It dos not work.

To replace the whole word (rather than part of the word):

string s = Regex.Replace(s, @"bwestb", "something");

Answer to the question is NO - you cannot use regexp in string.Replace.

If you want to use a regular expression, you must use the Regex class, as everyone stated in their answers.

Have you looked at Regex.Replace? Also, be sure to catch the return value; Replace (via any string mechanism) returns a new string - it doesn't do an in-place replace.

Try using the System.Text.RegularExpressions.Regex class. It has a static Replace method. I'm not good with regular expressions, but something like

string outputText = Regex.Replace(inputText, "(\sWest.\s)", temp);

should work, if your regular expression is correct.

USe this code if you want it to be case insensitive

string pattern = @"bwestb";

string modifiedString = Regex.Replace(input, pattern, strReplacement, RegexOptions.IgnoreCase);

I agree with Robert Harvey's solution except for one small modification:

s = Regex.Replace(s, @"bwestb", "something", RegexOptions.IgnoreCase);

This will replace both "West" and "west" with your new word

Insert the regular expression in the code before class

using System.Text.RegularExpressions;

below is the code for string replace using regex

string input = "Dot > Not Perls";

// Use Regex.Replace to replace the pattern in the input.

string output = Regex.Replace(input, "some string", ">");

source : http://www.dotnetperls.com/regex-replace

In Java, String#replace accepts strings in regex format but C# can do this as well using extensions:

public static string ReplaceX(this string text, string regex, string replacement) {

    return Regex.Replace(text, regex, replacement);

}

And use it like:

var text = "      space          more spaces  ";

text.Trim().ReplaceX(@"s+", " "); // "space more spaces"