Common validation reg_javascript techniques in JavaScript

Good JS verification ~~~~~~~~~~~~~~~~~~~~~~~~~

Purpose: Verify the format of IP address

Input: Strip:ip Address

Returns: False if return true through validation;

*/function IsIP (strip) {if (IsNull (strip)) return false; var re=/^ (\d+) \. (\d+) \. (\d+) \. (\d+) $/g//matching the regular expression of an IP address if (re.test (StrIP)) {if (regexp.$1 <256 && regexp.$2<256 && regexp.$3< 
256 && regexp.$4<256) return true; 
return false; /* Purpose: Check that the input string is empty or all are space input: STR returns: If ALL is null return True, otherwise return false */function IsNull (str) {if (str = "") returns TR 
Ue 
var Regu = "^[]+$"; 
var re = new RegExp (Regu); 
return Re.test (str); /* Purpose: Check that the value of the input object conforms to the integer format input: The string returned by the STR input: false/function Isinteger (str) {var regu =/^[-]{0,1 If validation returns True 
}[0-9]{1,}$/; 
return Regu.test (str); /* Purpose: Check the input mobile phone number is correct input: s: string return: If you return true through validation, false/function Checkmobile (s) {var regu =/^[1][3][0-9]{9 
}$/; 
var re = new RegExp (Regu); 
if (Re.test (s)) {return true; 
}else{return false; Usage: Check that the input string conforms to a positive integer format input: S: string return: false/function Isnumber (s) {var regu = "^[0-9]+$" If passed by validation returns true 
; var re = new RegExp (regu); 
if (S.search (re)!=-1) {return true; 
else {return false; Use: Check whether the input string is a decimal number format, can be negative input: s: string return: If you return true by validation, false/function Isdecimal (str) {if IsInteg 
ER (str)) return true; var re =/^[-]{0,1} (\d+) [\.] 
+ (\d+) $/; 
if (Re.test (str)) {if (regexp.$1==0&&regexp.$2==0) return false; 
return true; 
else {return false; Use: Check that the value of the input object conforms to the port number format input: The string returned by the STR input: false/function isport (str) {return (isnumber) if validation returns True 
R) && str<65536); /* Purpose: Check that the value of the input object conforms to the e-mail format input: The string returned by the str input: If you return true through validation, false/function Isemail (str) {var myreg =/^[-_a -za-z0-9]+@ ([_a-za-z0-9]+\.) 
+[a-za-z0-9]{2,3}$/; 
if (Myreg.test (str)) return true; 
return false; /* Purpose: Check that the input string is in line with the amount format is defined as a positive number with a decimal point, with a maximum of three digits after the decimal: s: string return: false/function Ismoney (s) {var Regu = "^[0-9]+[\." [0-9] 
{0,3}$ "; 
var re = new RegExp (Regu); 
if (Re.test (s)) {return true; 
else {return false; }/* Purpose: Check the lossEnter whether the string consists of English letters and numbers and underscores input: s: string return: false/function Isnumberor_letter (s) {//To determine whether it is a number or letter Var Regu if you return true through validation 
= "^[0-9a-za-z\_]+$"; 
var re = new RegExp (Regu); 
if (Re.test (s)) {return true; 
}else{return false; Use: Check that the input string is composed of English letters and numbers only.: s: String return: false/function Isnumberorletter (s) {//Judge whether it is a number or word if validation returns true 
female var Regu = "^[0-9a-za-z]+$"; 
var re = new RegExp (Regu); 
if (Re.test (s)) {return true; 
}else{return false; Use: Check that the input string is made up of Chinese characters, letters, and Numbers: value: String return: false/function Ischinaornumborlett (s) {// 
Whether is the Chinese character, the letter, the numeral composition var Regu = "^[0-9a-za-z\u4e00-\u9fa5]+$"; 
var re = new RegExp (Regu); 
if (Re.test (s)) {return true; 
}else{return false; }/* Purpose: To determine whether the date entered: Date: date; FMT: Date format return: false/function isDate (date, FMT) {if (fmt==null) f by validation returns true 
Mt= "YYYYMMDD"; 
var yindex = fmt.indexof ("yyyy"); 
if (yindex==-1) return false; 
var year = date.substring (yindex,yindex+4); var mindex = fmt.iNdexof ("MM"); 
if (mindex==-1) return false; 
var month = date.substring (mindex,mindex+2); 
var dindex = Fmt.indexof ("dd"); 
if (dindex==-1) return false; 
var day = date.substring (dindex,dindex+2); if (!isnumber) | | Year> "2100" | | 
year< "1900") return false; if (!isnumber (month) | | Month> "12" | | 
month< "") return false; 
if (Day>getmaxday (year,month) | | | | day< ") return false; 
return true; } function Getmaxday (year,month) {if month==4| | month==6| | month==9| | 
month==11) return "30"; 
if (month==2) if (year%4==0&&year%100!=0 | | year%400==0) return "29"; 
else return "28"; 
return "31"; }/* Purpose: Character 1 is the string 2 end Input: str1: string; str2: The contained string returns: false/Function Islastmatch (STR1,STR2) {var i, if returned by validation 
Ndex = Str1.lastindexof (STR2); 
if (str1.length==index+str2.length) return true; 
return false; }/* Purpose: Character 1 is entered as a String 2: str1: string; str2: The contained string returns: false/Function Isfirstmatch (STR1,STR2) {var) if validation returns True 
index = Str1.indexof (STR2); if (Index==0) return true; 
return false;  /* Purpose: Character 1 is a containing string 2 input: str1: string; str2: The contained string returns: false/Function IsMatch (STR1,STR2) {var index = If passed by validation returns true 
Str1.indexof (STR2); 
if (index==-1) return false; 
return true; /* Purpose: Check that the starting and ending date of the input is correct, the rule is two dates, the format is correct, and end as scheduled >= start date input: StartDate: Start date, string EndDate: End as expected, string return: Returns the FA if the validation returns true 
LSE/function Checktwodate (startdate,enddate) {if (!isdate (startdate)) {alert ("Incorrect start date!"); 
return false; 
else if (!isdate (EndDate)) {alert ("Incorrect end date!"); 
return false; 
else if (StartDate > EndDate) {alert ("Start date cannot be greater than End date!"); 
return false; 
return true; /* Purpose: Check the input Email box format is entered correctly: Stremail: string return: If you return true through validation, false/function Checkemail (stremail) {//var E Mailreg =/^[_a-z0-9]+@ ([_a-z0-9]+\.) 
+[a-z0-9]{2,3}$/; var Emailreg =/^[\w-]+ (\.[ \w-]+) *@[\w-]+ (\.[ 
\w-]+) +$/; 
if (Emailreg.test (Stremail)) {return true; }else{alert ("The email address you entered is not in the correct format!") 
"); 
return false; Use: Check the input phone number format entered correctly: StrphoNE: string return: false/function Checkphone (strphone) {var Phoneregwitharea =/^[0][1-9]{2,3}-[0-9]{5 If return true through validation 
, 10}$/; 
var phoneregnoarea =/^[1-9]{1}[0-9]{5,8}$/; 
var prompt = "The phone number you entered is not correct!" 
if (Strphone.length > 9) {if (Phoneregwitharea.test (Strphone)) {return true; 
}else{alert (prompt); 
return false; 
}else{if (phoneregnoarea.test (Strphone)) {return true; 
}else{alert (prompt); 
return false; Usage: Check the number of selected check boxes enter: Checkboxid: String return: Returns the number selected in this check box/function Checkselect (CHECKBOXID) {var check 
= 0; 
var i=0; if (document.all (CHECKBOXID). length > 0) {for (i=0; I<document.all (CHECKBOXID). length; i++) {if document.all ( 
CHECKBOXID). Item (i). checked) {check + 1; 
}}else{if (document.all (CHECKBOXID). checked) check = 1; 
} return check; 
The function gettotalbytes (Varfield) {if (Varfield = null) return-1; 
var totalcount = 0; for (i = 0; i< varField.value.length; i++) {if (varField.value.charCodEAt (i) > 127) TotalCount + + 2; 
else totalcount++; 
return totalcount; 
function Getfirstselectedvalue (CHECKBOXID) {var value = null; 
var i=0; if (document.all (CHECKBOXID). length > 0) {for (i=0; I<document.all (CHECKBOXID). length; i++) {if document.all (ch 
ECKBOXID). Item (i). checked) {value = document.all (CHECKBOXID). Item (i). value; 
Break 
}} else {if (document.all (CHECKBOXID). Checked) value = document.all (CHECKBOXID). value; 
return value; 
function Getfirstselectedindex (CHECKBOXID) {var value =-2; 
var i=0; if (document.all (CHECKBOXID). length > 0) {for (i=0; I<document.all (CHECKBOXID). length; i++) {if document.all (c 
HECKBOXID). Item (i). checked) {value = i; 
Break 
}} else {if (document.all (CHECKBOXID). Checked) value =-1; 
return value; 
function SelectAll (checkboxid,status) {if (document.all (CHECKBOXID) = null) return; if (document.all (CHECKBOXID). length > 0) {for (i=0; I<document.all checkbOXID). length; 
i++) {document.all (CHECKBOXID). Item (i). checked = status; 
} else {document.all (CHECKBOXID). checked = status; 
} function Selectinverse (CHECKBOXID) {if document.all (CHECKBOXID) = null) return; if (document.all (CHECKBOXID). length > 0) {for (i=0; I<document.all (CHECKBOXID). length; i++) {document.all (chec 
KBOXID). Item (i). Checked =!document.all (CHECKBOXID). Item (i) checked; 
} else {document.all (CHECKBOXID). Checked =!document.all (CHECKBOXID). checked; 
} function Checkdate (value) {if (value== ') return true; 
if (value.length!=8 | |!isnumber (value)) return false; 
var year = value.substring (0,4); 
if (year> "2100" | | | | year< "1900") return false; 
var month = value.substring (4,6); 
if (month> "| | month<") return false; 
var day = value.substring (6,8); 
if (Day>getmaxday (year,month) | | | | day< ") return false; 
return true; /* Purpose: Check that the input start and end dates are correct, that the rule is in the correct or null format with two dates, and the ending date >= the starting Date input: StartDate: Start date, string EnddaTE: End Date, string return: false/function Checkperiod (startdate,enddate) {if (!checkdate (startdate)) {if passed by validation returns true 
Alert ("Incorrect start date!"); 
return false; 
else if (!checkdate (EndDate)) {alert ("Incorrect end date!"); 
return false; 
else if (StartDate > EndDate) {alert ("Start date cannot be greater than End date!"); 
return false; 
return true; /* Purpose: Check that the securities code is correctly entered: Seccode: Securities code return: If you return true through validation, false/function Checkseccode (seccode) {if (Seccode) is returned. 
Length!=6) {alert ("The Securities code length should be 6 digits"); 
return false; 
} if (!isnumber (Seccode)) {alert ("Securities code can contain only numbers"); 
return false; 
return true; 
/**************************************************** Function:ctrim (Sinputstring,itype) Description: A function of a string to space parameters:itype:1= Remove the space on the left side of the string 2= Remove the space on the left of the string 0= remove the left and right spaces of the string return value: A string that removes the space ********************************** 
/function Ctrim (sinputstring,itype) {var stmpstr = '; 
var i =-1; 
if (Itype = = 0 | | itype = = 1) {while (stmpstr = = ") {++i; Stmpstr = SinputstrinG.substr (i,1); 
} sinputstring = sinputstring.substring (i); 
} if (Itype = = 0 | | itype = 2) {stmpstr = '; 
i = sinputstring.length; 
while (stmpstr = = ") {i; 
Stmpstr = Sinputstring.substr (i,1); 
} sinputstring = Sinputstring.substring (0,i+1); 
return sinputstring; }

The above is small set to introduce the JavaScript commonly used in the verification of Reg, I hope to help you, if you have any questions please give me a message, small series will promptly reply to everyone. Here also thank you very much for the cloud Habitat Community website support!