Slight improvement on LessCSS's handling of string interpolation in URLs

less-1.1.3.js.patch

// less-1.1.3.js

// starting around line 2268

// modify the regex to handle the condition of an interpolated string 

//  /^(?:https?:\/\/|file:\/\/|data:\/\/|@{)?/
//  /^(?:https?:\/|file:\/|data:\/)?\//



tree.URL = function (val, paths) {
    if (val.data) {
        this.attrs = val;
    } else {
        // Add the base path if the URL is relative and does not start with an interpolated string and we are in the browser
        if (!/^(?:https?:\/\/|file:\/\/|data:\/\/|@{)?/.test(val.value) && paths.length > 0 && typeof(window) !== 'undefined') {
            val.value = paths[0] + (val.value.charAt(0) === '/' ? val.value.slice(1) : val.value);
        }
        this.value = val;
        this.paths = paths;
    }
};