用正则表达式限制文本框只能输入数字,小数点,英文字母,汉字等各类代码

1.文本框只能输入数字代码(小数点也不能输入)
CODE:

<input type="text" onkeyup="this.value=this.value.replace(//D/g,")" onafterpaste="this.value=this.value.replace(//D/g,")">

2.只能输入数字和小数点
CODE:

<input  type=text t_value="" o_value=""  onkeypress="if(!this.value.match(/^[/+/-]?/d*?/.?/d*?$/))this.value=this.t_value;else  this.t_value=this.value;if(this.value.match(/^(?:[/+/-]?/d+(?:/./d+)?)?$/))this.o_value=this.value"  onkeyup="if(!this.value.match(/^[/+/-]?/d*?/.?/d*?$/))this.value=this.t_value;else  this.t_value=this.value;if(this.value.match(/^(?:[/+/-]?/d+(?:/./d+)?)?$/))this.o_value=this.value"  onblur="if(!this.value.match(/^(?:[/+/-]?/d+(?:/./d+)?|/./d*?)?$/))this.value=this.o_value;else{if(this.value.match(/^/./d+$/))this.value=
0+this.value;if(this.value.match(/^/.$/))this.value=0;this.o_value=this.value}">

4.只能输入汉字
CODE:

<input type="text" onkeyup="this.value=this.value.replace(/[^/u4e00-/u9fa5]/g,")">

5.只能输入英文
CODE:

<input type="text" onkeyup="this.value=this.value.replace(/[^a-zA-Z]/g,'')">

6.只能输入数字和英文( . 和 / 也被屏蔽，如不屏蔽这两个，则使用replace(/[^/w/.//]/ig,’’) )
CODE:

<input onkeyup="value=value.replace(/[^/w]/ig,'')">