var aa = "<img src='aa111.jpg'><p></p><div class='demo'>444</div>r32r32r";
//get img label
aa.replace(/<img [^>]*src=['"]([^'"]+)[^>]*>/gi, function (match) {
console.log(match);
});
//get src value
aa.replace(/<img [^>]*src=['"]([^'"]+)[^>]*>/gi, function (match, capture) {
console.log(capture);
});
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