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string str="<p> </p><p><img title="img1" border="0" name="img1" alt="" class="aaa" src="img4.gif" /></p><input type="text" name="t1"/><img title="img2" border="0" name="img2" alt="" class="bbb" src="img4.gif" /><p> <img title="img3" border="0" name="img3" alt="" class="aaa" src="img4.gif" /></p> <p><img title="img4" border="0" name="img4" alt="" class="bbb" src="img4.gif" /></p> <input type="radio" name="t11"/> "
"(?is)<img[^>]*?class="aaa"[^>]*?>"
<img[^/]*title="([^"]*)"[^/]*name="([^"]*)"[^/]*class="[^"]*"[^/]*src="([^"]*)"[^/]*/>
分组1(title) 分组2(name) 分组3(src)
------- ------- ------
img1 img1 img4.gif
img2 img2 img4.gif
img3 img3 img4.gif
img4 img4 img4.gif