lib/utils.js
/**
* Normalize the given path string,
* returning a regular expression.
*
* An empty array should be passed,
* which will contain the placeholder
* key names. For example "/user/:id" will
* then contain ["id"].
*
* @param {String|RegExp} path
* @param {Array} keys
* @param {Boolean} sensitive
* @param {Boolean} strict
* @return {RegExp}
* @api private
*
* CREDIT: https://github.com/visionmedia/express/blob/3.4.2/lib/utils.js#L294
*/
exports.pathRegexp = function(path, keys, sensitive, strict) {
if (path instanceof RegExp) { return path; }
path = path
.concat(strict ? '' : '/?')
.replace(/\/\(/g, '(?:/')
.replace(/(\/)?(\.)?:(\w+)(?:(\(.*?\)))?(\?)?(\*)?/g, function(_, slash, format, key, capture, optional, star){
keys.push({ name: key, optional: !! optional });
slash = slash || '';
return ''
+ (optional ? '' : slash)
+ '(?:'
+ (optional ? slash : '')
+ (format || '') + (capture || (format && '([^/.]+?)' || '([^/]+?)')) + ')'
+ (optional || '')
+ (star ? '(/*)?' : '');
})
.replace(/([\/.])/g, '\\$1')
.replace(/\*/g, '(.*)');
return new RegExp('^' + path + '$', sensitive ? '' : 'i');
};