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<script>
var str = '<img-aaa-zzz> <img-bbb-zzz> <img-ccc-zzz> <img-aaa-zzz>';
var hits = str.match(/\<img/ig);
if (hits){
alert(hits.length);
} else {
alert('0');
}
</script>
<script>
var str = '<img-aaa-zzz> <img-bbb-zzz> <img-aa-zzz> <img-aaa-zzz>';
var hits = str.match(/<img\b((?!bbb|ccc)[^>])*>/ig);
if (hits){
alert(hits.length);
} else {
alert('没有');
}
</script>
var reg = /<img\b((?!bbb|ccc)[^>])*>/ig;
var reg = /<img\b((?!bbb|ccc)[\w\W])*>/ig;