Question

I am trying to replace a specific sub string from a string in C#.

My string is: This is a car.

And I am trying to replace ‘a’ with string.Empty from the string with this code:

data = data.Replace("a", string.Empty);

But my output is :

This is c r.

I just want to remove isolated occurence of ‘a’, and not when this char/word is used in some other word (like car).

I want a output like ths: This is car.

How can I do this in C#?

Answer 1

You need a regex pattern that only matches “a” on word boundaries. "\b" in a regex pattern denotes a word boundary:

Regex.Replace("this is a car", @"\ba\b", "")

If you want to match uppercase “A” as well, make sure your pattern is ignoring case (RegexOptions.IgnoreCase) or explicitly add “A” to the pattern like "\b[Aa]\b".