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

Efficiently Removing Non-ASCII Characters in C# Strings

Handling strings containing non-ASCII characters often requires removing them for compatibility or data processing. This article demonstrates a concise C# solution using regular expressions.

The Solution: Leveraging Regex.Replace()

The Regex.Replace() method provides an effective way to eliminate non-ASCII characters:

<code class="language-csharp">string s = "søme string";
s = Regex.Replace(s, @"[^\u0000-\u007F]+", string.Empty);</code>

Detailed Explanation

• Regex.Replace() takes a regular expression pattern and a replacement string.
• The pattern @"[^u0000-u007F] " targets any character sequence outside the ASCII range (u0000-u007F).
• string.Empty replaces matched characters with nothing, effectively removing them.
• The ^ (caret) negates the character range, ensuring only non-ASCII characters are matched.
• u####-u#### denotes a Unicode character range. Here, it specifies characters from Unicode 0 to 127 (the ASCII set).

Understanding the Approach

As noted by Gordon Tucker, this regular expression efficiently matches all characters not within the specified ASCII range. This direct approach is precise and avoids unnecessary complexity.

Conclusion

This Regex.Replace() method provides a clean and efficient way to remove non-ASCII characters from your C# strings, ensuring data integrity and compatibility across various systems.

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1. u0000-u007F ↩

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