一些正则在js使用方法

输入框直接正则判断

<input type="password" name="pwd" placeholder="密码只能以数字\英文\@\." onkeyup="value=value.replace(/[^\a-\z\A-\Z0-9\u4E00-\u9FA5\@\.]/g,'')" />

在js中判断

<div class="control-group">
        <label class="laber_from">手机号</label>
    <div  class="controls" >
    <INPUT id='tel_id' class="input_from" type="text" placeholder=" 请输入手机号" name='tel'/>
    <P id="p2" class=help-block></P>
    </div>
</div>

<script>
    $('#tel_id').blur(function(){
        var tel_val = $(this).val();
         if(tel_val =='' || !/((\d{})|^((\d{,})|(\d{}|\d{})-(\d{,})|(\d{}|\d{})-(\d{,})-(\d{}|\d{}|\d{}|\d{})|(\d{,})-(\d{}|\d{}|\d{}|\d{}))$)/.test(tel_val))
         {
         $('#p2').html('<p>手机格式有误</p>').css('color','red');
     }else{
         $('#p2').empty();
     }
    })

</script>

满足了条件才可以按提交按钮

<FORM action="__URL__/question" method="post">
        <DIV class="control-group">
            <LABEL class="laber_from">旧密保问题</LABEL>
            <DIV  class="controls" ><INPUT class="input_from" type="text" placeholder=" 请输入密保问题" onkeyup="value=value.replace(/^[a-zA-Z0-9]\w{16,17}$/g,'')" name='question'/><P id="p0" class=help-block></P></DIV>
        </DIV>
        <DIV class="control-group">
            <LABEL class="laber_from">新保问题</LABEL>
            <DIV  class="controls" ><INPUT class="input_from" type="text" placeholder=" 请输入密保问题" onkeyup="value=value.replace(/^[a-zA-Z0-9]\w{16,17}$/g,'')" name='question'/><P id="p1" class=help-block></P></DIV>
        </DIV>
        <DIV class="control-group">
            <LABEL class="laber_from" ></LABEL>
            <DIV class="controls" ><button disabled class="btn btn-success" style="width:120px;" >提交</button></DIV>
        </DIV>
</FORM>

<script>
    $('input:eq(1)').blur(function(){
        var one = $(this).val();
        $('#p1').empty();
        var errorMsg = '密保问题不能为空';
        if(one =='')
        {
            $('#p1').append('<span style="color:red">'+errorMsg+'</span>');
            $('button').attr('disabled','disabled');
        }else if(one != '' && input_0 !=''){
            $('button').attr('disabled',false);
        }
    })
</script>