JS Common regular expressions and JS control input Box input limit (numbers, characters, characters)

Verification Number: ^[0-9]*$
To verify N-bit numbers: ^\d{n}$
Verify that at least n digits: ^\d{n,}$
Verify the number of m-n bits: ^\d{m,n}$
Verify numbers starting with 0 and non 0: ^ (0|[ 1-9][0-9]*) $
Verify that there is a positive real number with two decimal places: ^[0-9]+ (. [ 0-9]{2})? $
Verify that there is a positive real number with 1-3 decimal places: ^[0-9]+ (. [ 0-9]{1,3})? $
Verify non-zero positive integers: ^\+? [1-9] [0-9]*$
To verify a nonzero negative integer: ^\-[1-9][0-9]*$
Validates non-negative integers (positive integers + 0) ^\d+$
Validates a non-positive integer (negative integer + 0) ^ ((-\d+) | ( 0+)) $
Verify the character with a length of 3: ^. {3}$
Validates a string consisting of 26 English letters: ^[a-za-z]+$
Validates a string consisting of 26 uppercase English letters: ^[a-z]+$
Validates a string consisting of 26 lowercase English letters: ^[a-z]+$
Validates a string consisting of a number and 26 English letters: ^[a-za-z0-9]+$
Validates a string consisting of a number, 26 letters, or underscores: ^\w+$
Verify user password: ^[a-za-z]\w{5,17}$ the correct format is: Start with a letter, the length is between 6-18, and can contain only characters, numbers, and underscores.
Verify that it contains ^%& ',; =?$\ ' characters:[^%& ', =?$\x22]+
Verify Kanji: ^[\u4e00-\u9fa5],{0,}$
Verify email Address: ^\w+[-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) *$
Verify interneturl:^http://([\w-]+\.) +[\w-]+ (/[\w-./?%&=]*)? $; ^[a-za-z]+://(w+ (-w+) *) (. ( w+ (-w+) *) * (? s*)? $
Verify the phone number: ^ (\ (\d{3,4}\) |\d{3,4}-)? \d{7,8}$:--the correct format is: xxxx-xxxxxxx,xxxx-xxxxxxxx,xxx-xxxxxxx,xxx-xxxxxxxx,xxxxxxx, XXXXXXXX.
Verify your Social Security number (15-bit or 18-digit number): ^\d{15}|\d{}18$
Validation 12 months of the year: ^ (0?[ 1-9]|1[0-2]) $ correct format: "01"-"09" and "1" "12"
Verify one months of 31 days: ^ ((0?[ 1-9]) | ((1|2) [0-9]) |30|31) $ The correct format is: 01, 09 and 1, 31.
Integer: ^-?\d+$
Non-negative floating-point number (positive floating point + 0): ^\d+ (\.\d+)? $
Positive floating-point number ^ ([0-9]+\.[ 0-9]*[1-9][0-9]*) | ([0-9]*[1-9][0-9]*\. [0-9]+) | ([0-9]*[1-9][0-9]*)) $
Non-positive floating-point number (negative floating point + 0) ^ ((-\d+ (\.\d+)?) | (0+ (\.0+)?)) $
Negative floating-point number ^ (-([0-9]+\.[ 0-9]*[1-9][0-9]*) | ([0-9]*[1-9][0-9]*\. [0-9]+) | ([0-9]*[1-9][0-9]*))) $
Floating point ^ (-?\d+) (\.\d+)? $

use JS to control the input box inputs number, Chinese characters, characters

1. Text box can only enter a numeric code (the decimal point can not be entered)
<input onkeyup= "This.value=this.value.replace (/\d/g, ')" onafterpaste= "This.value=this.value.replace (/\D/g, ' ) ">
2. Only the number can be entered and the decimal point will be lost.
<input onkeyup= "if (IsNaN (value)) ExecCommand (' Undo ')" Onafterpaste= "if (IsNaN (value)) ExecCommand (' Undo ')" >
<input name=txt1 onchange= "if (/\d/.test (this.value)) {alert (' Input number only '); this.value= ';}" >
3. Number and decimal method two
<input type=text t_value= "" o_value= "" onkeypress= "if (!this.value.match.? \d*?$/)) This.value=this.t_value;else this.t_value=this.value;if (This.value.match (?: [/^ (?: \. \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+)?)? $/)) This.o_value=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 (/^ \.$/)) This.value=0;this.o_value=this.value} ">
4. Only letters and kanji can be entered
<input onkeyup= "Value=value.replace (/[\d]/g, ')" onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[\d]/g, ') "maxlength=10 name=" Numbers ">
5. Only English letters and numbers can be entered, not Chinese
<input onkeyup= "Value=value.replace (/[^\w\.\/]/ig, ')" >
6. Only enter numbers and English <font color= "Red" >chun</font>
<input onkeyup= "Value=value.replace (/[^\d|chun]/g, ')" >
7. Only a maximum of two digits after the decimal point (numeric, Chinese can be entered), can not enter letters and operation symbols:
<input onkeypress= "if ((event.keycode<48 | | event.keycode>57) && event.keycode!=46 | |/\.\d\d$/.test ( Value)) Event.returnvalue=false ">
8. Only a maximum of two digits after the decimal point (numbers, letters, Chinese can be entered), you can enter the operation symbol:
<input onkeyup= "This.value=this.value.replace (/^ (\-) * (\d+) \. ( \d\d). *$/, ' $1$2.$3 ') ">
can only be numbers and decimal points and plus minus multiply
onkeypress= "Return event.keycode>=4&&event.keycode<=57"

Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
The following untested, please verify after use
1. Enter only numbers and English:
<input onkeyup= "Value=value.replace (/[\w]/g, ')" onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^\d]/g, ') "id=" Text1 "name=" Text1 ">
2. Only numbers can be entered:
<input onkeyup= "Value=value.replace (/[^\d]/g, ')" onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^\d]/g, ') "id=" Text2 "name=" Text2 ">
3. Only full-width input:
<input onkeyup= "Value=value.replace (/[^\uff00-\uffff]/g, ')" onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^\uff00-\uffff]/g, ') "id=" Text3 "name=" Text3 ">
4. Only the Chinese characters can be entered:
<input onkeyup= "Value=value.replace (/[^\u4e00-\u9fa5]/g, ')" onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^\u4e00-\u9fa5]/g, ') "id=" Text4 "name=" TEXT4 ">
5. Email Address verification:
var Regu = "^ (([0-9a-za-z]+) | ( [0-9a-za-z]+[_.0-9a-za-z-]*[0-9a-za-z]+) @ ([a-za-z0-9-]+[.]) + ([a-za-z]{2}|net|net|com|com|gov|gov|mil|mil|org|org|edu|edu|int|int) $ "
var re = new RegExp (Regu);
if (S.search (re)! =-1) {
return true;
} else {
Window.alert ("Please enter a valid legal e-mail address!") ")
return false;
}
6. Identity card:
"^\\d{17} (\\d|x) $"
7.17 Regular Expressions

/^[a-za-z0-9\u4e00-\u9fa5]+$/Digital Text Letters

"^\\d+$"//nonnegative integer (positive integer + 0)
"^[0-9]*[1-9][0-9]*$"//Positive integer
"^ ((-\\d+) | (0+)) $ "//non-positive integer (negative integer + 0)
"^-[0-9]*[1-9][0-9]*$"//Negative integer
"^-?\\d+$"//Integer
"^\\d+ (\\.\\d+)? $"//non-negative floating-point number (positive floating point + 0)
^ ([0-9]+\\]. [0-9]*[1-9][0-9]*) | ([0-9]*[1-9][0-9]*\\. [0-9]+) | ([0-9]*[1-9][0-9]*)) $ "//positive floating-point number
"^ ((-\\d+ (\\.\\d+)?) | (0+ (\\.0+)?)) $ "//non-positive floating-point number (negative floating-point number + 0)
^ (-([0-9]+\\]. [0-9]*[1-9][0-9]*) | ([0-9]*[1-9][0-9]*\\. [0-9]+) | ([0-9]*[1-9][0-9]*))) $ "//negative floating-point number
^ (-?\\d+) (\\.\\d+)? $ "//floating-point number
"^[a-za-z]+$"//A string consisting of 26 English letters
"^[a-z]+$"//A string consisting of 26 uppercase letters in English
"^[a-z]+$"//String consisting of 26 English letters in lowercase
"^[a-za-z0-9]+$"//string consisting of a number and 26 English letters
"^\\w+$"//A string consisting of numbers, 26 letters or underscores
"^[\\w-]+ (\\.[ \\w-]+) *@[\\w-]+ (\\.[ \\w-]+) +$ "//email address
"^[a-za-z]+://(\\w+ (-\\w+) *) ( \\w+ (-\\w+) *) * (\\?\\s*)? $ "//url
=============================================
1. The dashed box when the button is pressed
Add attribute value Hidefocus or hidefocus=true in input

2. Read-only text box contents
Add the attribute value in input readonly
3. Prevent the text document from being emptied (you can use the style content as a class reference)
<input Style=behavior:url (#default #savehistory); Type=text id=opersistinput>
4.ENTER key to move the cursor to the next input box
<input onkeydown= "if (event.keycode==13) event.keycode=9" >
5. Only Chinese (with flashing)
<input onkeyup= "value="/value.replace (/["-~]/g,") "onkeydown=" if (event.keycode==13) event.keycode=9 ">
6. Only digital (with flashing)
<input onkeyup= "value="/value.replace (/["^\d]/g,") "Onbeforepaste=" Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^\d]/g, ')) ">
7. Only digital (no flashing)
<input ime-mode:disabled "onkeydown=" if (event.keycode==13) event.keycode=9 "onkeypress=" if ((event.keyCode<48 || event.keycode>57)) Event.returnvalue=false ">
8. Only input English and numerals (with flashing)
<input onkeyup= "value="/value.replace (/[\w]/g, "')" onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^\d]/g, ')) ">
9. Shielding Input Method
<input type= "text" name= "url" ime-mode:disabled "onkeydown=" if (event.keycode==13) event.keycode=9 ">
10. Enter only digits, decimal point, minus (-) character (no flashing)
<input onkeypress= "if (event.keycode!=46 && event.keycode!=45 && (event.keycode<48 | | event.keycode>57)) Event.returnvalue=false ">
11. Only two decimal places can be entered, three decimal places (with flashing)
<input maxlength=9 onkeyup= "if (Value.match (/^\d{3}$/)) value="/value.replace (Value,parseint (VALUE/10)) "; value= "/value.replace (/\.\d*\./g, '." ') "onkeypress=" if ((event.keycode<48 | | event.keycode>57) && event.keycode!=46 && event.keycode!=45 | | Value.match (/^\d{3}$/) | | /\.\d{3}$/.test (value)) {Event.returnvalue=false} "Id=text_kfxe name=text_kfxe>
"^\\d+$"//nonnegative integer (positive integer + 0)
"^[0-9]*[1-9][0-9]*$"//Positive integer
"^ ((-\\d+) | (0+)) $ "//non-positive integer (negative integer + 0)
"^-[0-9]*[1-9][0-9]*$"//Negative integer
"^-?\\d+$"//Integer
"^\\d+ (\\.\\d+)? $"//non-negative floating-point number (positive floating point + 0)
^ ([0-9]+\\]. [0-9]*[1-9][0-9]*) | ([0-9]*[1-9][0-9]*\\. [0-9]+) | ([0-9]*[1-9][0-9]*)) $ "//positive floating-point number
"^ ((-\\d+ (\\.\\d+)?) | (0+ (\\.0+)?)) $ "//non-positive floating-point number (negative floating-point number + 0)
^ (-([0-9]+\\]. [0-9]*[1-9][0-9]*) | ([0-9]*[1-9][0-9]*\\. [0-9]+) | ([0-9]*[1-9][0-9]*))) $ "//negative floating-point number
^ (-?\\d+) (\\.\\d+)? $ "//floating-point number
"^[a-za-z]+$"//A string consisting of 26 English letters
"^[a-z]+$"//A string consisting of 26 uppercase letters in English
"^[a-z]+$"//String consisting of 26 English letters in lowercase
"^[a-za-z0-9]+$"//string consisting of a number and 26 English letters
"^\\w+$"//A string consisting of numbers, 26 letters or underscores
"^[\\w-]+ (\\.[ \\w-]+) *@[\\w-]+ (\\.[ \\w-]+) +$ "//email address
"^[a-za-z]+://(\\w+ (-\\w+) *) ( \\w+ (-\\w+) *) * (\\?\\s*)? $ "//url
"^ ((\d{1,3} (, \d{3}) | \d+) (\.\d+)? $//Decimal with commas
The specific use
<script language=javascript>
var mm=/^\d+$/;
function FormCheck ()
{
if (!mm.test (Document.f1.PropertyAmount.value))
{
Alert ("Please enter a valid number");
Document.f1.PropertyAmount.focus ();
return false;
}
return true;
}

JS Common regular expressions and JS control input Box input limit (numbers, characters, characters)