getJSONPath.js

function isRightPattern (actual, expected){
  if(expected instanceof RegExp){
    return expected.test(actual);
  } else {
    return actual === expected;
  }
}

function extractPatterns(obj,expected) {
  if(!obj || typeof obj !== 'object') return {};
  var ar = {}; var path = '';
  function inc(k,root) {
    if(Array.isArray(root)) path += ('[' + k + ']');
    else if(path) path += ('.' + k);
    else path = k;
  }
  function dec(root) {
    if(path) {
      path = path.substring(0, path.lastIndexOf(Array.isArray(root) ? '[' : '.'));
    }
  }
  function scan(obj) {
    var k,v;
    if (obj instanceof Object) {
      for (k in obj){
        if (obj.hasOwnProperty(k)){
          v = obj[k];
          if(typeof(v) === 'string') {
            if(isRightPattern(v,expected)) {
              inc(k,obj);
              ar[path] = v;
              dec();
            }
          } else if(v && typeof(v) === 'object') {
            inc(k,obj);
            scan(obj[k]);
            dec(obj);
          }
        }
      }
    }
  }
  scan(obj);
  return ar;
}