How to remove extra returns and spaces in a string by regex?

Question

我将HTML代码转换为纯文本。但是有很多额外的返回和空格。如何删除它们？

Answer 1

string new_string = Regex.Replace(orig_string, @"\\s", "") will remove all whitespace

string new_string = Regex.Replace(orig_string, @"\\s+", " ") will just collapse multiple whitespaces into one

Answer 2

I'm assuming that you want to

• find two or more consecutive spaces and replace them with a single space, and
• find two or more consecutive newlines and replace them with a single newline.

If that's correct, then you could use

resultString = Regex.Replace(subjectString, @"( |\r?\n)\1+", "$1");

This keeps the original "type" of whitespace intact and also preserves Windows line endings correctly. If you also want to "condense" multiple tabs into one, use

resultString = Regex.Replace(subjectString, @"( |\t|\r?\n)\1+", "$1");

To condense a string of newlines and spaces (any number of each) into a single newline, use

resultString = Regex.Replace(subjectString, @"(?:(?:\r?\n)+ +){2,}", @"\n");

Answer 3

I used a lot of algorithm for that. Every loop was good but this was clear and absolute.

//define what you want to remove as char

char tb = (char)9; //Tab char ascii code
spc = (char)32;    //space char ascii code
nwln = (char)10;   //New line char ascii char

yourstring.Replace(tb,"");
yourstring.Replace(spc,"");
yourstring.Replace(nwln,"");

//by defining chars, result was better.

Answer 4

You can use Trim() to remove the spaces and returns. In HTML the spaces is not important so you can omit them by using the Trim() method in System.String class.