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var s = '<div id="abc" class="testabc">testabc</div>fdssdf' +
'<div class="xyz">xyz</div>fdsf' +
'<div class="testfdsf">fdsf</div>fdsf' +
'<div class="abc">abc</div>',
reg = /<div\s+[^>]*?class=['"]test.+?<\/div>/gi;
alert(s.match(reg).join(',\r\n'))