JavaScript Trim() And Normalize-space() Functions

Just wanted to share two handy RegEx expressions to strips leading and
trailing white-space from a string, and to replace all repeated spaces,
newlines and tabs with a single space.

* JavaScript example:

String.prototype.trim = function() {
// Strip leading and trailing white-space
return this.replace(/^s*|s*$/g, "");
}

String.prototype.normalize_space = function() {
// Replace repeated spaces, newlines and tabs with a single space
return this.replace(/^s*|s(?=s)|s*$/g, "");
}

" one two three
".trim(); // --> "one two three"
" one two three
".normalize_space(); // --> "one two three"