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正则表达式，只匹配一次下化线！

　　 [Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

　　但是这样必须包含"_"否则就会输出falsh

　　要求的效果为出现两个 “_” 才false,并且没有“_”的情况下也是true

　　

<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3CSCRIPT%20LANGUAGE%3D%22VBScript%22%3E%20%0D%0A%3C!--%20%0D%0ADim%20re%2Cstr%2Ctemps%20%0D%0ASet%20re%3Dnew%20RegExp%20%0D%0Are.IgnoreCase%20%3Dtrue%20%0D%0Are.Global%3DTrue%20%0D%0A%0D%0Astr%3D%22a_%22%20%0D%0Are.Pattern%3D%22%5E%5Ba-z%5D%5B%5E%5C_%5D*%5C_%5B%5E%5C_%5D*%24%22%3Astr%3Dre.Test(str)%20%0D%0Atemps%3Dstr%20%0D%0AMsgBox(temps)%20%0D%0Aset%20re%3DNothing%20%0D%0A%2F%2F--%3E%20%0D%0A%3C%2FSCRIPT%3E">

<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3CSCRIPT%20LANGUAGE%3D%22VBScript%22%3E%20%0D%0A%3C!--%20%0D%0ADim%20re%2Cstr%2Ctemps%20%0D%0ASet%20re%3Dnew%20RegExp%20%0D%0Are.IgnoreCase%20%3Dtrue%20%0D%0Are.Global%3DTrue%20%0D%0A%0D%0Astr%3D%22ad%22%20%0D%0Are.Pattern%3D%22%5E%5Ba-z%5D%5B%5E%5C_%5D*%5C_%5B%5E%5C_%5D*%24%22%3Astr%3Dre.Test(str)%20%0D%0Atemps%3Dstr%20%0D%0AMsgBox(temps)%20%0D%0Aset%20re%3DNothing%20%0D%0A%2F%2F--%3E%20%0D%0A%3C%2FSCRIPT%3E">

　　 [Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

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