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  • JSP中直接用正则表达式校验

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
        <head>
            <title> 验证数字最简单<a href="http://www.jb51.net/list/list_6_1.htm" target="_blank"><font color=red>正则</font></a>表达式大全 </title>
        </head>
        <body>
            <h3>输入完按回车后即可验证!</h3>
            正整数:    <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^\d+$/.test(this.value));" />
            <br>
            负整数:    <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-\d+$/.test(this.value));" />
            <br>
            整 数:    <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?\d+$/.test(this.value));" />
            <br>
            正小数:    <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^\d+\.\d+$/.test(this.value));" />
            <br>
            负小数:    <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-\d+\.\d+$/.test(this.value));" />
            <br>
            小 数:    <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?\d+\.\d+$/.test(this.value));" />
            <br>
            实 数:    <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?\d+\.?\d*$/.test(this.value));" />
            <br>
            保留1位小数:<input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?\d+\.?\d{0,1}$/.test(this.value));" />
            <br>
            保留2位小数:<input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?\d+\.?\d{0,2}$/.test(this.value));" />
            <br>
            保留3位小数:<input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?\d+\.?\d{0,3}$/.test(this.value));" />
            <br>
        </body>
    </html>

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  • 原文地址:https://www.cnblogs.com/Cratical/p/1806725.html
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