Insert space when a continuous word is 50 characters long

I want to cut this string into 50 characters where (after a space) it starts count开发者_JS百科ing up to 50 (excluding spaces), and if the section is over 50 it inserts a space. So far, I can cut it up, but I don't know how to specify "exclude spaces". Tried [^\s] but no joy.

var str = " http://this.domain.com/fff/222/widget.css http://www.domain.com/myfolder/uploads/1/3/3/7/2332053/custom_themes/8787687678644/more_custom_themes/files/my-main_style.css?8763487634 http://cdn.domain.com/folder/images/thisfolder/common.css?9444"
str.replace(/\s(\w.{50})/g,' $1 ');

Try this:

var str = " http://this.domain.com/fff/222/widget.css http://www.domain.com/myfolder/uploads/1/3/3/7/2332053/custom_themes/8787687678644/more_custom_themes/files/my-main_style.css?8763487634 http://cdn.domain.com/folder/images/thisfolder/common.css?9444"
str = str.replace(/([^ ]{50})/g, "$1 ");

If your reason for doing this is to prevent a long string from breeaking out of its area in a browser window, you may want to try the CSS solution:

CSS has a word-wrap property, which you can use to tell the browser to break long words even if they don't have a natural break-point.

#divwithlongword {
    word-wrap: break-word;
}

Now if you have HTML as follows:

<div id='divwithlongword'>myextraordinarilyandexcessivelylongdomainnamegoeshere.com</div>

...it will wordwrap where it needs to within the domain name.

This is supported in all major browsers -- see http://caniuse.com/#search=wordwrap

Hope that helps.

You use the following regex:

(\S{50})

\S - Matches any character that is not a whitespace character (spaces, tabs, line breaks).