[title][id] type weburl cannot be recognize correctly

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for example:
I get 10 times more traffic from [Google][1] than from
[Yahoo][2] or [MSN][3].
sentences like above cannot be translated correctly,because the StringUtils class has its disadvantage in eliminate()

[liushenming]

I use minumum match in pattern_squarebracket and pattern_squarebracket2,and fix the bug