regex remove all non alphanumeric code example

Example 1: remove non alphanumeric characters javascript

input.replace(/\W/g, '') //doesnt include underscores


input.replace(/[^0-9a-z]/gi, '') //removes underscores too

Example 2: c# filter non alphanumeric characters

Regex rgx = new Regex("[^a-zA-Z0-9 -]");
str = rgx.Replace(str, "");

Example 3: remove all non alphabetic characters from string c#

var cleanString = new string(dirtyString.Where(Char.IsLetter).ToArray());

Example 4: regex remove all non alphanumeric except spaces

/[^[:alnum:]\x20/gi