indexesOf.js

// A function to return an array of indexes for a matching string.
// Usage : indexesOf('this, this this', 'this');
// Usage : indexesOf('this, this this', /t[a-z]{3}/);
// -> [{"index":0,"length":4,"match":"this"},
//    {"index":6,"length":4,"match":"this"},
//    {"index":11,"length":4,"match":"this"}]
//
// The 'and' method:
// Usage : indexesOf('this, this this', /t[a-z]{3}/).and(/i/);
// -> [{"index":0,"length":4,"match":"this"},
//    {"index":6,"length":4,"match":"this"},
//    {"index":11,"length":4,"match":"this"},
//    {"index":2,"length":1,"match":"i"},
//    {"index":8,"length":1,"match":"i"},
//    {"index":13,"length":1,"match":"i"}]
function indexesOf(string, match) {
  var index   = 0;
  var indexes = [];
  var max     = string.length;
  function isRegularExpression() {
    var currentIndex  = string.substr(index, max - index).search(match);
    var matchedString = string.match(match);
    if (matchedString) {
      matchedString = matchedString[0];
      while (currentIndex !== -1 && index < max) {
        indexes.push({
          index  : index + currentIndex,
          length : matchedString.length,
          match  : matchedString
        });
        index        += currentIndex + matchedString.length;
        currentIndex  = string.substr(index, max - index).search(match);
        if (currentIndex !== -1) {
          matchedString = string.substr(index, max - index).match(match)[0];
        }
      }
    }
  }
  function isString() {
    var currentIndex = string.substr(index, max - index).indexOf(match);
    while (currentIndex !== -1 && index < max) {
      indexes.push({
        index  : index + currentIndex,
        length : match.length,
        match  : match
      });
      index        += currentIndex + match.length;
      currentIndex  = string.substr(index, max - index).indexOf(match);
    }
  }
  function and(match) {
    indexes     = indexes.concat(indexesOf(string, match));
    indexes.and = and;
    return indexes;
  }
  if (typeof match === 'string') {
    isString();
  } else if (typeof match.test === 'function') {
    isRegularExpression();
  }
  indexes.and = and;
  return indexes;
}