Need a Regular Expression that replaces all duplicate whitespace -next to each other- with a single whitepsace

I have a simple piece of script (which uses RegEx) which cleans up a source string to leave only alpha-numeric-and-whitespace characters.

Sometimes, I end up with a number of whitespace characters next to each other.

eg.

source: abc def ghi 
result: abc def ghi

source: a*bc D*f
result: abc df

source: a*bc *** def
result: abc  def  <-- notice the two spaces in there
expected result: abc def  <-- notice one space, here.

So i was hoping some regex could look for 2开发者_如何学JAVA+ spaces next to each other, in some source string and replace it with a single whitespace character.

cheers :)

Just use \s\s+ as the string to match, and a single space as the replacement.

In C# this would be:

Regex regex = new Regex("\\s\\s+");
string output = regex.Replace(input, " ");

Here's a quick JavaScript function. This does all whitespace, not just spaces.

function stripExtraSpaces(text)
{
   var exp = new RegExp("[\\s]+","g");
   return text.replace(exp," ");
}