Regular/\d/g

Onkeyup= "This.value=this.value.replace (/\d/g, ');"
What's the red consciousness?

What do you mean,/g?

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/g is a global match

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You can use Perl-style expressions in JS
/expression Content/Parameters
such as/\d/g

G: Global Match

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\d: Similar to [^0-9] non-digital
/g: Global

Replace all non-digits with empty

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/Must be added?

var reg =/expression/img;

Before and after the two "/" is required, just like the syntax rules, as the declaration string
String test = "only a test";
Before and after the "" "must have the same, grammatical rules, no reason to speak

IMG is a mode, optional parameter
I ignore case
M Multi-line mode
G Global Mode----------------------------------
http://bbs.csdn.net/topics/340198344
http://msdn.microsoft.com/zh-cn/library/ae5bf541 (v=vs.90). aspx----------------------------------

Integer or decimal: ^[0-9]+\. {0,1} [0-9] {0,2}$
Only numbers can be entered: "^[0-9]*$".
Only n digits can be entered: "^\d{n}$".
Only numbers with at least n digits can be entered: "^\d{n,}$".
You can enter only the digits of the m~n bit:. "^\d{m,n}$"
Only numbers starting with 0 and non-0 can be entered: "^ (0|[ 1-9][0-9]*) $ ".
You can only enter a positive real number with two decimal places: "^[0-9]+ (. [ 0-9]{2})? $ ".
You can only enter a positive real number with a decimal position: "^[0-9]+ (. [ 0-9]{1,3})? $ ".
You can only enter a non-zero positive integer: "^\+?" [1-9] [0-9]*$].
You can only enter a non-zero negative integer: "^\-[1-9][]0-9" *$.
Only characters with a length of 3 can be entered: "^. {3}$ ".
You can only enter a string consisting of 26 English letters: "^[a-za-z]+$".
You can only enter a string consisting of 26 uppercase English letters: "^[a-z]+$".
You can only enter a string consisting of 26 lowercase English letters: "^[a-z]+$".
You can only enter a string consisting of a number and 26 English letters: "^[a-za-z0-9]+$".
You can only enter a string consisting of a number, 26 letters, or underscores: "^\w+$".
Verify user password: "^[a-za-z]\w{5,17}$" is in the correct format: start with a letter, length between 6~18, can contain only characters, numbers, and underscores.
Verify that it contains ^%& ',; =?$\ ' characters: "[^%& ',; =?$\x22]+".
Only Chinese characters can be entered: "^[\u4e00-\u9fa5]{0,}$"
Verify email Address: "^\w+ ([-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) *$ ".
Verify InternetURL: "^http://([\w-]+\.) +[\w-]+ (/[\w-./?%&=]*)? $ ".
Verify the phone number: "^ (\ (\d{3,4}-) |\d{3.4}-)? \d{7,8}$" The correct format is: "Xxx-xxxxxxx", "xxxx-xxxxxxxx", "xxx-xxxxxxx", "xxx-xxxxxxxx", " XXXXXXX "and" XXXXXXXX ".
Verify the Social Security number (15-bit or 18-digit number): "^\d{15}|\d{18}$".
Validation 12 months of the year: "^ (0?[ 1-9]|1[0-2]) $ "The correct format is:" 01 "~" 09 "and" 1 "~" 12 ".
Verify one months of 31 days: "^ ((0?[ 1-9]) | ((1|2) [0-9]) |30|31) $ "correct format for;" 01 "~" 09 "and" 1 "~" 31 ".
Regular expressions that match Chinese characters: [\U4E00-\U9FA5]

Match double-byte characters (including kanji): [^\x00-\xff]

Application: Calculates the length of a string (a double-byte character length meter 2,ascii character 1)
String.prototype.len=function () {return this.replace (/[^\x00-\xff]/g, "AA"). Length;

Regular expression that matches a blank line: \n[\s|] *\r

Regular expressions Matching HTML tags:< (. *) > (. *) <\/(. *) >|< (. *) \/>

Regular expression matching the leading and trailing spaces: (^\s*) | (\s*$)

Application: There is no trim function like VBScript in JavaScript, and we can use this expression to do the following:

String.prototype.trim = function ()
{
Return This.replace (/(^\s*) | ( \s*$)/g, "");
}

Use regular expressions to decompose and convert IP addresses:

The following is a JavaScript program that matches an IP address with a regular expression and translates an IP address into a corresponding value:

function IP2V (IP)
{
re=/(\d+) \. (\d+) \. (\d+) \. (\d+)/g//matching regular expressions for IP addresses
if (Re.test (IP))
{
Return Regexp.$1*math.pow (255,3)) +regexp.$2*math.pow (255,2)) +regexp.$3*255+regexp.$4*1
}
Else
{
throw new Error ("not a valid IP address!")
}
}

However, the above program without regular expression, and directly with the split function decomposition may be more simple, the program is as follows:

var ip= "10.100.20.168"
Ip=ip.split (".")
Alert ("IP value is:" + (IP[0]*255*255*255+IP[1]*255*255+IP[2]*255+IP[3]*1))

Regular expression matching email address: \w+ ([-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) *

Regular expression matching URL URL:/http ([\w-]+\.) +[\w-]+ (/[\w-./?%&=]*)?

Use regular expressions to restrict the entry of text boxes in Web Forms:

Use regular expression restrictions to enter only Chinese: onkeyup= "value=value.replace (/[^\u4e00-\u9fa5]/g,") "Onbeforepaste=" Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^\u4e00-\u9fa5]/g, ') "

Restrict only full-width characters with regular expressions: onkeyup= "Value=value.replace (/[^\uff00-\uffff]/g,") "Onbeforepaste=" Clipboarddata.setdata (' Text ', Clipboarddata.getdata (' text '). Replace (/[^\uff00-\uffff]/g, ')) "

Use regular expression restrictions to enter only numbers: onkeyup= "Value=value.replace (/[^\d]/g,") "Onbeforepaste=" Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^\d]/g, ')) "

Use regular expression restrictions to enter only numbers and English: onkeyup= "Value=value.replace (/[\w]/g,") "Onbeforepaste=" Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^\d]/g, ')) "

<input onkeyup= "Value=value.replace (/[^\u4e00-\u9fa5\w]/g, ')" onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^\u4e00-\u9fa5\w]/g, ') "value=" allow underscore, alphanumeric and kanji ">

<script language= "JavaScript" >
if (document.layers)//Trigger keyboard event
Document.captureevents (event.keypress)

function XZ (thsv,nob) {
if (nob== "2") {
Window.clipboardData.setData ("Text", "" ")
Alert ("Avoid illegal character input, do not copy characters");
return false;
}
if (event.keycode!=8 && event.keycode!=16 && event.keycode!=37 && event.keycode!=38 && event.keycode!=39 && event.keycode!=40) {
thsvv=thsv.value;//the value entered
Thsvs=thsvv.substring (thsvv.length-1);//The last character entered
Thsvss=thsvv.substring (0,thsvv.length-1);//Remove the last error character
if (!thsvs.replace (/[^\u4e00-\u9fa5\w]/g, ') | | event.keycode==189) {//Regular drop symbol and underscore key
Thsv.value= ' do not enter illegal symbols [' +thsvs+ '];
Alert (' Do not enter illegal symbols [' +thsvs+ '] ');
Thsv.value= "";
return false;
}
}
}

</script>

<input onkeyup= "XZ (this,1)" onpaste= "XZ (this,2)" value= "" > Allow alphanumeric letters and kanji

<script language= "JavaScript" >&NBSP;
<!-- 
function MaxLength (field,maxlimit) { 
var j = field.value.replace (/[^\x00-\xff]/g, "* *"). length; 
//alert (j);  
var tempstring=field.value ;  
var tt= "";  
if (J > Maxlimit) { 
for (Var i=0;i<maxlimit;i++) { 
if ( Tt.replace (/[^\x00-\xff]/g, "* *"). Length < Maxlimit)  
TT = TEMPSTRING.SUBSTR (0,i+1);  
else 
break; 
} 
if (Tt.replace (/[^\x00-\xff]/g, "* *"). Length > Maxlimit)  
Tt=tt.substr (0 , tt.length-1);  
Field.value = tt; 
}else{ 
;  
} 
} 
</script

Single-line text box control <br/>
<input type= "text" id= "Text1" name= "Text1" onpropertychange= "MaxLength (this, 5)" ><br/>
Multiline text box control: <br/>
<textarea rows= "14"
cols= "id=" Textarea1 "name=" Textarea1 "onpropertychange=" MaxLength (This,) "></textarea><br/>

Control the contents of the form can only enter numbers, Chinese ....
<script>
function test ()
{
if (DOCUMENT.A.B.VALUE.LENGTH>50)
{
Alert ("Cannot exceed 50 characters!") ");
Document.a.b.focus ();
return false;
}
}
</script>
<form name=a onsubmit= "return Test ()" >
<textarea name= "B" cols= "+" wrap= "VIRTUAL" rows= "6" ></textarea>
<input type= "Submit" name= "Submit" value= "Check" >
</form>

Can only be Chinese characters
<input onkeyup= "Value=value.replace (/[^\u4e00-\u9fa5]/g, ')" >

can only be English characters
<script language=javascript>
function Onlyeng ()
{
if (! ( EVENT.KEYCODE>=65&&EVENT.KEYCODE<=90))
Event.returnvalue=false;
}
</script>

<input onkeydown= "Onlyeng (); >
<input name= "Coname" type= "text" size= "" maxlength= "+" class= "Input2" onkeyup= "Value=value.replace (/[\w]/g, ') "Onbeforepaste=" clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^\d]/g, ')) ">
Can only be a number
<script language=javascript>
function Onlynum ()
{
if (! ( (event.keycode>=48&&event.keycode<=57) | | (event.keycode>=96&&event.keycode<=105)))
Consider the numeric keys on the keypad
Event.returnvalue=false;
}
</script>

<input onkeydown= "Onlynum (); >

can only be English characters and numbers
<input onkeyup= "Value=value.replace (/[\w]/g, ')" onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^\d]/g, ')) ">

Verify to email format
<script Language=javascript runat=server>
function Isemail (stremail) {
if (Stremail.search (/^\w+ (-\w+) | ( \.\w+)) *\@[a-za-z0-9]+ ((\.| -) [a-za-z0-9]+] *\. [a-za-z0-9]+$/)! =-1)
return true;
Else
Alert ("Oh");
}
</SCRIPT>
<input type=text onblur=isemail (this.value) >

Mask keyword (sex, fuck)-Modified
<script language= "JavaScript1.2" >
function Test () {
if ((A.b.value.indexof ("sex") = = 0) | | (A.b.value.indexof ("fuck") = = 0)) {
Alert ("Four Graces and three Passions");
A.b.focus ();
return false;}
}
</script>
<form name=a onsubmit= "return Test ()" >
<input Type=text name=b>
<input type= "Submit" name= "Submit" value= "Check" >
</form>

You can only enter numbers in the Limit text box
<input onkeyup= "if (event.keycode!=37 && event.keycode! =) Value=value.replace (/\d/g, ');" Onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/\d/g, ')" >

<pixtel_mmi_ebook_2005>2 </PIXTEL_MMI_EBOOK_2005>

Regular/\d/g