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first
String.prototype.regexIndexOf = function(regex, startpos) {
  var indexOf = this.substring(startpos || 0).search(regex);
  return (indexOf >= 0) ? (indexOf + (startpos || 0)) : indexOf;
}
var cssText = "#div2{left: 375px;top: 250px;height: 40px;width:100px;position: absolute;background-color: #66CCFF;};";
var id = "#div2";
cssText.regexIndexOf(/left\s*?:\s*?\d+px;/ig)
ready
second
String.prototype.regexIndexOf = function(regex, startpos) {
  var indexOf = this.substring(startpos || 0).search(regex);
  return (indexOf >= 0) ? (indexOf + (startpos || 0)) : indexOf;
}
var cssText = "#div2{left: 375px;top: 250px;height: 40px;width:100px;position: absolute;background-color: #66CCFF;};";
var id = "#div2";
cssText.regexIndexOf(/left\s*?:([^;]*)px;/ig)
ready

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