<xmltag1 abc="1234" def="1" ghi="567">
<xmltag2 abc="5678" def="0" ghi="qwe">
<xmltag3 abc="hijk" qwerty="on" no="234">
<xmltag4 qwerty="on" abc="regular expression" def="0" yahoo="google">
...
<xmltag100 google="yahoo" abc="bing" qwerty="456">
更新1:
單以([A-Za-z]+)無法搜到abc="regular expression"一項