Restricting text boxes with regular expressions only numbers, decimal points, English letters, Chinese characters, etc. regular expressions

1. Text box can only enter a numeric code (decimal point can not enter)
<input onkeyup= "This.value=this.value.replace (/\d/g,") "Onafterpaste=" This.value=this.value.replace (/\D/g, " ) ">

Or

<input onkeyup= ' if (this.value.length==1) {this.value=this.value.replace (/[^1-9]/g, ')}else{this.value= This.value.replace (/\d/g, ')} ' onafterpaste= ' if (this.value.length==1) {this.value=this.value.replace (/[^1-9]/g, ' ')}else{this.value=this.value.replace (/\d/g, ')} ' >

2. Only numbers can be entered and the decimal point may be lost.

<input type= "text" size= "onkeyup=" This.value=this.value.replace (/[^\d\.] +?/g, ")"/>
<input onkeyup= "if (isNaN (value)) ExecCommand (' Undo ') ' onafterpaste= ' if (isNaN (value)) ExecCommand (' Undo ') >
<input name=txt1 onchange= "if (/\d/.test (this.value)) {alert (' can only enter numbers '); this.value= ';} ' >

3. Number and decimal method two
<input type=text tvalue= "" ovalue= "" onkeypress= "if!this.value.match (/^[\+\-]?\d*?\.? \d*?$/)) This.value=this.t_value;else this.tvalue=this.value;if (This.value.match/^ (?: [\+\-]?\d+ (?: \. \d+)? $/)) This.ovalue=this.value "onkeyup=" if (!this.value.match/^[\+\-]?\d*?\.? \d*?$/)) This.value=this.t_value;else this.tvalue=this.value;if (This.value.match/^ (?: [\+\-]?\d+ (?: \. \d+)? $/)) This.ovalue=this.value "onblur=" if (!this.value.match (?: [/^ (?: \. \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.ovalue=this.value} ">

4. Only letters and characters can be entered
<input onkeyup= "Value=value.replace (/[\d]/g,") "Onbeforepaste=" Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[\d]/g, ') "maxlength=10 name=" Numbers ">

5. Can only enter English letters and numbers, can not enter Chinese
<input onkeyup= "Value=value.replace (/[^\w\.\/]/ig, ')" >

6. Only digital and English <font color= "Red" >chun</font>
<input onkeyup= "Value=value.replace (/[^\d|chun]/g, ')" >

7. Only a maximum of two digits after the decimal point (number, Chinese can be entered), can not enter letters and operational symbols:
<input onkeypress= "If" (event.keycode<48 | | event.keycode>57) && event.keycode!=46 | |/\.\d\d$/.test ( Value)) Event.returnvalue=false ">

8. After the decimal point can only have up to two digits (numbers, letters, Chinese can be entered), you can enter operational symbols:
<input onkeyup= "This.value=this.value.replace (/^ (\-) * (\d+) \. ( \d\d). *$/, ' $1$2.$3 ') >

JavaScript is a common form entry restriction feature that restricts user input when entering:

1. Text box can only enter a numeric code (decimal point can not enter)
< input onkeyup= "This.value=this.value.replace (/\d/g,") "Onafterpaste=" This.value=this.value.replace (/\D/g, " ) ">

2. Only numbers can be entered and the decimal point may be lost.
< input onkeyup= ' if (isNaN (value)) ExecCommand (' Undo ') ' onafterpaste= ' if (isNaN (value)) ExecCommand (' Undo ') >
< input onchange= "if (/\d/.test (this.value)) {alert (' only digits '); this.value= ';} ' name=txt1>

3. Number and decimal method two
< input Type=text tvalue= "" ovalue= "" onkeypress= "if!this.value.match (/^[\+\-]?\d*?\.? \d*?$/)) This.value=this.t_value;else this.tvalue=this.value;if (This.value.match/^ (?: [\+\-]?\d+ (?: \. \d+)? $/)) This.ovalue=this.value "onkeyup=" if (!this.value.match/^[\+\-]?\d*?\.? \d*?$/)) This.value=this.t_value;else this.tvalue=this.value;if (This.value.match/^ (?: [\+\-]?\d+ (?: \. \d+)? $/)) This.ovalue=this.value "onblur=" if (!this.value.match (?: [/^ (?: \. \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.ovalue=this.value} ">

4. Only letters and characters can be entered
< input onkeyup= "Value=value.replace (/[\d]/g,") "Onbeforepaste=" Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[\d]/g, ') "maxlength=10 name=" Numbers ">

5. Can only enter English letters and numbers, can not enter Chinese
< input onkeyup= "value=value.replace (/[^\w\.\/]/ig, ')" >

6. Only numbers and English can be entered
< input onkeyup= "value=value.replace (/[^\d|chun]/g, ')" >

7. Only a maximum of two digits after the decimal point (number, Chinese can be entered), can not enter letters and operation symbols
< input onkeypress= "if (event.keycode<48 | | event.keycode>57) && event.keycode!=46 | |/\.\d\d$/.test ( Value)) Event.returnvalue=false ">

8. Only a maximum of two digits after the decimal point (digits, letters, Chinese can be entered), you can enter operational symbols
< input onkeyup= "This.value=this.value.replace (/^ (\-) * (\d+) \. ( \d\d). *$/, ' $1$2.$3 ') >

9. Only Chinese can be entered:

< input name= "realname" type= "text" maxlength= "class=" Input_style "value=" "onkeyup=" Value=value.replace (/[^\ u4e00-\u9fa5]/g, "onbeforepaste=" clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^\ U4e00-\u9fa5]/g, ")"/>