How Can I Remove Non-ASCII Characters from a String in C#?

Efficiently Removing Non-ASCII Characters in C# Strings

Data processing often requires cleaning strings, and removing non-ASCII characters is a common task, particularly for legacy system compatibility. C# offers a straightforward solution using regular expressions.

Regular Expression Approach

The most efficient way to eliminate non-ASCII characters is through the Regex.Replace method. Here's how:

string inputString = "søme string with non-ASCII characters.";
string cleanString = Regex.Replace(inputString, @"[^\u0000-\u007F]+", "");

Understanding the Regular Expression

Let's dissect the regular expression [^u0000-u007F] :

• [^...]: This is a negated character class. It means "match any character that is not within the brackets."
• u0000-u007F: This specifies the Unicode range for ASCII characters (decimal 0-127).

Therefore, the entire expression matches one or more ( ) characters that fall outside the ASCII range.

Method Explanation

The Regex.Replace method systematically searches the inputString for any sequences of non-ASCII characters and replaces them with an empty string (""), effectively removing them. The resulting cleanString contains only ASCII characters.

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