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C# Remove Character From String

In this article, we will be looking at several ways to remove characters from a string in the C# programming language. We will be discussing different methods related to string variables like the “Remove()”,” Replace()”, “Join()”, and “Split()” function to delete characters from a string in the Ubuntu 20.04 environment. We will also be using a special class called LINQ in the C# programming language, which is the language integrated query that has many useful functions regarding strings and characters.

Method 01: Using the Remove() Function to Remove a Character From a String in Ubuntu 20.04

In this method, we will be using the Remove() Function to remove a character from a string variable. The Remove() Function takes the index number of the string as the parameter; the index number is an indicator from where the character would be removed from the string variable. We will transform a string variable with a character into a new string variable that will have no characters.

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We have created a string variable “s” and inserted some text in it with a character in the C# program above. After this, we initialize a new string variable which takes the previous string variable with the character and calls the remove function with an index number of the string from where the character would be removed.

After running the above C# program On the Ubuntu 20.04 command line terminal, you will get the following output shown below:

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As we can see in the output screen, the character from the string is removed successfully, but this method will only be useful when the characters are on the ending index of the string.

Method 02: Using the Replace() Function

After using the Remove() function to remove a character from a string variable, we will be moving to the replace function in the C# programming language, which can also be used for the same purpose, but we will have to make several adjustments to the string by using the Empty function as well. So, in this method, we will be using both the Replace() and Empty functions to remove several characters from a string variable.

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In the above code, we have initialized the string variable and stored some text along with some characters in it; then, we made a list named “characters” in which we stored all the characters. After this, we started a foreach loop in which we transformed this string variable by using the replace and empty function by removing all the characters from the string. In the end, we printed out this string after the loop was completed.

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After we compile and execute the above program, we will get the output shown in the above snippet. As you can see, the string variable is completely transformed, and all the characters are removed from it.

Method 03: Using the Regex.Replace() Function to Remove Characters From a String Variable in Ubuntu 20.04

In this method, we will be using a new namespace called “Text.RegularExpressions”, which has a Regex.Replace() function from which we will be deleting the characters from a string variable. Unlike the normal Replace function in which the character list has to be separately inserted, the Regex.Replace() function can take in the characters as a parameter directly along with the empty function. It is a more refined approach for removing characters from a string variable.

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In the above C# program, we will be initializing a string variable with some characters and text stored in it. Then we will directly transform the string variable by using the Regex.Replace() function, the first parameter of this function will be the string variable itself, then the list of characters will be given as the second parameter, and the third parameter will be the empty function which will help in transforming the string variable. Now we will execute the above program on our Ubuntu 20.04 command line terminal and get the below output:

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In the above snippet, we can see that the string variable is successfully transformed and has no more characters left in it, referring to the fact that the program worked efficiently.

Method 04: Using the LINQ Library Queries to Remove Characters From a String in Ubuntu 20.04

The LINQ library is a SQL mimicking programming language which has similar functions as the SQL queries and can perform a similar operation in the C# programming language. We will be using the “from”, “where”, and “select” queries from the LINQ library to remove characters from a string variable. All these functions will differentiate the text and characters from the string, and then the ToArray() function will add the selected text characters as a string.

The above C# program has the “System.Linq” namespace already stated at the start of the program. Then the string variable “str” is initialized along with text and characters stored in it. After this, we will be calling the string variable again and using the SQL queries command “From”, “Where”, and “Select” to get to the string and traverse through it. The letters, digits, and the spaces between the words will be selected one by one by the functions in the “Where” query, and then the ToArray() function will store these selections in the string, which will be printed out in the closing line of the program.

After we compile the above code and execute it on the Ubuntu 20.04 terminal, we will be getting the following output:

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The output shows that the string has been cleared of all the characters and the program was a success.

Method 05: Using the Join() and Split() Functions for Removing the Characters From a String in Ubuntu 20.04

The Join() and Split() functions are also suitable approaches for removing characters from a string variable. The split() function can be used as a way to remove characters from a string, and the join() function will be used for joining the string after eliminating the characters. This method is more efficient than the previous Replace() function as we will not have to use the for loop to traverse through the string variable.

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In the above piece of code, we will be initializing the string variable and storing some text in it with multiple characters as well. Then the string will undergo some transformation by the Join() function, which will take the Split() function as a parameter which will have the characters listed in its parameter brackets. The interdependency of both the functions will remove the characters and transform the string.

After compiling and executing the above code, we will get the following output shown below in the snippet.

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The string variable is completely changed and now has no characters left in it.

Conclusion

In this article, the different approaches for removing characters from a string variable were discussed in the C# programming language. The basic functions like Remove() and Replace were discussed and implemented in the Ubuntu 20.04 environment. Then we moved towards more complex and effective methods like the Regex.Replace(), Join(), Split() functions to remove the characters from a string variable. We also used the LINQ library of the C# programming language for calling its query-like methods, which helped in removing characters from a string variable.

About the author

Aqsa Yasin

I am a self-motivated information technology professional with a passion for writing. I am a technical writer and love to write for all Linux flavors and Windows.