c# Fastest way to remove extra white spaces

by

The fastest way? Iterate over the string and build a second copy in a StringBuilder character by character, only copying one space for each group of spaces.

The easier to type Replace variants will create a bucket load of extra strings (or waste time building the regex DFA).

Edit with comparison results:

Using http://ideone.com/NV6EzU, with n=50 (had to reduce it on ideone because it took so long they had to kill my process), I get:

Regex: 7771ms.

Stringbuilder: 894ms.

Which is indeed as expected, Regex is horribly inefficient for something this simple.

More Related Contents:

  1. Efficient way to remove ALL whitespace from String?
  2. How do I replace the *first instance* of a string in .NET?
  3. Replace “\\” with “\” in a string in C#
  4. How to replace multiple white spaces with one white space
  5. Is there an alternative to string.Replace that is case-insensitive?
  6. How to remove all white space from the beginning or end of a string?
  7. How to replace part of string by position?
  8. C# String replace with dictionary
  9. Alternative to multiple String.Replaces [duplicate]
  10. C# string replace
  11. Fastest way to remove white spaces in string
  12. Regex : how to get words from a string (C#)
  13. Replacing escape characters from JSON
  14. Reversing the given string without using reverse function [closed]
  15. Iterating through a List and .Contains isn’t catching string [closed]
  16. Why does Read interfere with ReadLine? [duplicate]
  17. .NET String.Format() to add commas in thousands place for a number
  18. Easiest way to split a string on newlines in .NET?
  19. Remove spaces from std::string in C++
  20. Convert a list to a string in C#
  21. Replace Multiple String Elements in C#
  22. Multiple string comparison with C#
  23. String concatenation vs String Builder. Performance
  24. Getting hash of a list of strings regardless of order
  25. String.Replace ignoring case
  26. Adding a newline into a string in C#
  27. How to get a null terminated string from a C# string?
  28. Help with \0 terminated strings in C#
  29. How to replace the text between two characters in c#
  30. Why is the length of this string longer than the number of characters in it?

Leave a Comment