allow space in regex code example

Example 1: regex to remove spaces

//..
return str.replace(/\s/g, '');
//..

Example 2: regex for letters and spaces

/* Note this works with the onkeyup function in html with js */

function lettersandSpacesOnly(input){
    var regexs = /[^a-z ]*$/gmi;
    input.value = input.value.replace(regexs, "");
  }

Example 3: space allow in regex

Just add a space in your character class.

^[a-zA-Z0-9_ ]*$