Remove all if None English from a string
<p>I have a string that contain None-English :</p>

<pre><code>អត���រាប���រូរប���រាក���ថ���ង���ទី 03-06-2011 ម������ង 07:30 នាទី រូបិយប���ឞ���ឞ​ អត���រា​ ទិញចូល លក���ច���ញ រូបិយប���ឞ���ឞ​ប���រទ�����​អា�����ីប���រាក���រ���ល (1usd)4,1004,107បាត ថ���ឡង��� (1usd)30.1530.23រុង 
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<p>Anybody could tell me how can I remove the non-english string</p>
