文本框输入限制

<script>
                                    function regInput(obj, reg, inputStr)
                                    {
                                    var docSel = document.selection.createRange()
                                    if (docSel.parentElement().tagName != "INPUT") return false
                                    oSel = docSel.duplicate()
                                    oSel.text = ""
                                    var srcRange = obj.createTextRange()
                                    oSel.setEndPoint("StartToStart", srcRange)
                                    var str = oSel.text + inputStr + srcRange.text.substr(oSel.text.length)
                                    return reg.test(str)
                                    }
                                    </script>
                                    小写英文：<xmp style= "display:inline"> </xmp>
                                    <input onkeypress = "return regInput(this, /^[a-z]*$/,  String.fromCharCode(event.keyCode))"
                                    onpaste  = "return regInput(this, /^[a-z]*$/,  window.clipboardData.getData('Text'))"
                                    ondrop  = "return regInput(this, /^[a-z]*$/,  event.dataTransfer.getData('Text'))"
                                    style="ime-mode:Disabled"
                                    ><br>
                                    大写英文：<xmp style= "display:inline"> </xmp>
                                    <input onkeypress = "return regInput(this, /^[A-Z]*$/,  String.fromCharCode(event.keyCode))"
                                    onpaste  = "return regInput(this, /^[A-Z]*$/,  window.clipboardData.getData('Text'))"
                                    ondrop  = "return regInput(this, /^[A-Z]*$/,  event.dataTransfer.getData('Text'))"
                                    style="ime-mode:Disabled">
                                    <br>
                                    任意数字：<xmp style="display:inline"> </xmp>
                                    <input onkeypress = "return regInput(this, /^[0-9]*$/,  String.fromCharCode(event.keyCode))"
                                    onpaste  = "return regInput(this, /^[0-9]*$/,  window.clipboardData.getData('Text'))"
                                    ondrop  = "return regInput(this, /^[0-9]*$/,  event.dataTransfer.getData('Text'))"
                                    style="ime-mode:Disabled"
                                    ><br>
                                    限2位小数：<xmp style="display:inline"> </xmp>
                                    <input onkeypress = "return regInput(this, /^/d*/.?/d{0,2}$/,  String.fromCharCode(event.keyCode))"
                                    onpaste  = "return regInput(this, /^/d*/.?/d{0,2}$/,  window.clipboardData.getData('Text'))"
                                    ondrop  = "return regInput(this, /^/d*/.?/d{0,2}$/,  event.dataTransfer.getData('Text'))"
                                    style="ime-mode:Disabled"
                                    > 如: 123.12<br>
                                    日　  期：<xmp style="display:inline"> </xmp>
                                    <input onkeypress = "return regInput(this, /^/d{1,4}([-//](/d{1,2}([-//](/d{1,2})?)?)?)?$/,  String.fromCharCode(event.keyCode))"
                                    onpaste  = "return regInput(this, /^/d{1,4}([-//](/d{1,2}([-//](/d{1,2})?)?)?)?$/,  window.clipboardData.getData('Text'))"
                                    ondrop  = "return regInput(this, /^/d{1,4}([-//](/d{1,2}([-//](/d{1,2})?)?)?)?$/,  event.dataTransfer.getData('Text'))"
                                    style="ime-mode:Disabled"
                                    > 如: 2002-9-29<br>
                                    任意中文：<xmp style="display:inline"> </xmp>
                                    <input onkeypress = "return regInput(this, /^$/,     String.fromCharCode(event.keyCode))"
                                    onpaste  = "return regInput(this, /^[/u4E00-/u9FA5]*$/, window.clipboardData.getData('Text'))"
                                    ondrop  = "return regInput(this, /^[/u4E00-/u9FA5]*$/, event.dataTransfer.getData('Text'))"
                                    ><br>
                                    部分英文：<xmp style="display:inline"> </xmp>
                                    <input onkeypress = "return regInput(this, /^[a-e]*$/,  String.fromCharCode(event.keyCode))"
                                    onpaste  = "return regInput(this, /^[a-e]*$/,  window.clipboardData.getData('Text'))"
                                    ondrop  = "return regInput(this, /^[a-e]*$/,  event.dataTransfer.getData('Text'))"
                                    style="ime-mode:Disabled"
                                    > 范围: a,b,c,d,e<br>
                                    部分中文：<xmp style="display:inline"> </xmp>
                                    <script language=javascript>
                                    function checkChinese(oldLength, obj)
                                    {
                                    var oTR = window.document.selection.createRange()
                                    var reg = /[^一二三四五六七八九十]/g
                                    oTR.moveStart("character", -1*(obj.value.length-oldLength))
                                    oTR.text = oTR.text.replace(reg, "")
                                    }
                                    </script>
                                    <input onkeypress="return false" onkeydown="setTimeout('checkChinese('+this.value.length+','+this.uniqueID+')', 1)"
                                    onpaste  = "return regInput(this, /^[一二三四五六七八九十]*$/,  window.clipboardData.getData('Text'))"
                                    ondrop  = "return regInput(this, /^[一二三四五六七八九十]*$/,  event.dataTransfer.getData('Text'))"
                                    > 范围: 一二三四五六七八九十<br>