How to find last space of a string using JavaScript and replace it with ` `?

Question

How to find last space of the para using JavaScript and replace it with  ?

<p class="no-space">Web Development Reading List</p>

(The space between the words "Reading" and "List" to be removed and want to have $nbsp; in place of that.

ie, Reading List

Answer 1

Use a replace with Regexp:

Using ID

var noSpace = document.getElementById("noSpace");
noSpace.innerHTML = noSpace.innerHTML.replace(/ (?=[^ ]*$)/i, " ");

<p class="no-space" id="noSpace">Web Development Reading List</p>

Using class name:

var noSpace = document.getElementsByClassName("no-space");
for (var i = 0; i < noSpace.length; i++) {
    noSpace[i].innerHTML = noSpace[i].innerHTML.replace(/ (?=[^ ]*$)/i, "&amp;nbsp;");
}

<p class="no-space">Web Development Reading List</p>
<p class="no-space">Web Development Reading List</p>
<p class="no-space">Web Development Reading List</p>

You can change   to " " if you need the character instead of the string.

Answer 2

Find your character by lastIndexOf() and use subStr to replace it through concatenation.

str = "Any string you want";
var lastIndex = str.lastIndexOf(" ");
str = str.substr(0, lastIndex) + '&nbsp' + str.substr(lastIndex + 1);