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Detailed explanation of JS regular expressions

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Release： 2018-03-30 17:32:53
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本文主要和大家分享JS正则表达式详解，主要以文字和代码的的方式和大家分享，希望能帮助到大家。

一、正則表達式應用 

“^\d+$”　　//非负整数（正整数 + 0）  
“^[0-9][1-9][0-9]
”　　//非正整数（负整数 + 0）  
“^-[0-9][1-9][0-9]
”　　　　//整数  
“^\d+(.\d+)?$”　　//非负浮点数（正浮点数 + 0）  
“^(([0-9]+.[0-9][1-9][0-9])|([0-9][1-9][0-9].[0-9]+)|([0-9][1-9][0-9]))
”　　//非正浮点数（负浮点数 + 0）  
“^(-(([0-9]+.[0-9][1-9][0-9])|([0-9][1-9][0-9].[0-9]+)|([0-9][1-9][0-9])))
”　　//浮点数  
“^[A-Za-z]+
”　　//由26个英文字母的大写组成的字符串  
“^[a-z]+
”　　//由数字和26个英文字母组成的字符串  
“^\w+
”　　　　//email地址  
“^[a-zA-z]+://(\w+(-\w+))(.(\w+(-\w+)))(\?\S)?$”　　//url 
/^(d{2}|d{4})-((0([1-9]{1}))|(1[1|2]))-((0-2)|(3[0|1]))$/   //  年-月-日 
/^((0([1-9]{1}))|(1[1|2]))/((0-2)|(3[0|1]))/(d{2}|d{4})
”   //Emil 
“(d+-)?(d{4}-?d{7}|d{3}-?d{8}|^d{7,8})(-d+)?”     //电话号码 
“^(d{1,2}|1dd|2[0-4]d|25[0-5]).(d{1,2}|1dd|2[0-4]d|25[0-5]).(d{1,2}|1dd|2[0-4]d|25[0-5]).(d{1,2}|1dd|2[0-4]d|25[0-5])
//MAC地址的正则表达式 
^[-+]?\d+(.\d+)?$  //值类型正则表达式

“^\d+$”　　//非负整数（正整数 + 0）  
“^[0-9][1-9][0-9]
”　　//非正整数（负整数 + 0）  
“^-[0-9][1-9][0-9]
”　　　　//整数  
“^\d+(\.\d+)?$”　　//非负浮点数（正浮点数 + 0）  
“^(([0-9]+\.[0-9][1-9][0-9])|([0-9][1-9][0-9]\.[0-9]+)|([0-9][1-9][0-9]))
”　　//非正浮点数（负浮点数 + 0）  
“^(-(([0-9]+\.[0-9][1-9][0-9])|([0-9][1-9][0-9]\.[0-9]+)|([0-9][1-9][0-9])))
”　　//浮点数  
“^[A-Za-z]+
”　　//由26个英文字母的大写组成的字符串  
“^[a-z]+
”　　//由数字和26个英文字母组成的字符串  
“^\w+
”　　　　//email地址  
“^[a-zA-z]+://(\w+(-\w+))(\.(\w+(-\w+)))(\?\S)?$”　　//url
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二、javascript正则表达式检验 

//校验是否全由数字组成  
function isDigit(s) 
{ 
var patrn=/^[0-9]{1,20}$/; 
if (!patrn.exec(s)) return false 
return true 
}
//校验登录名：只能输入5-20个以字母开头、可带数字、“_”、“.”的字串  
function isRegisterUserName(s) 
{ 
var patrn=/^[a-zA-Z]{1}([a-zA-Z0-9]|[._]){4,19}$/; 
if (!patrn.exec(s)) return false 
return true 
}
//校验用户姓名：只能输入1-30个以字母开头的字串  
function isTrueName(s) 
{ 
var patrn=/^[a-zA-Z]{1,30}$/; 
if (!patrn.exec(s)) return false 
return true 
}
//校验密码：只能输入6-20个字母、数字、下划线  
function isPasswd(s) 
{ 
var patrn=/^(\w){6,20}$/; 
if (!patrn.exec(s)) return false 
return true 
}
//校验普通电话、传真号码：可以“+”开头，除数字外，可含有“-”  
function isTel(s) 
{ 
//var patrn=/^[+]{0,1}(\d){1,3}[ ]?([-]?(\d){1,12})+
/; 
if (!patrn.exec(s)) return false 
return true 
}

//校验手机号码：必须以数字开头，除数字外，可含有“-” 
function isMobil(s) 
{ 
var patrn=/^[+]{0,1}(\d){1,3}[ ]?([-]?((\d)|[ ]){1,12})+$/; 
if (!patrn.exec(s)) return false 
return true 
}
//校验邮政编码 
function isPostalCode(s) 
{ 
//var patrn=/^[a-zA-Z0-9]{3,12}
/; 
if (!patrn.exec(s)) return false 
return true 
}

//校验搜索关键字 
function isSearch(s) 
{ 
var patrn=/^[^~!@#$%^&*()+=|\\\][\]\{\}:;\&#39;\,.<>/?]{1}[^~!@
/; 
if (!patrn.exec(s)) return false 
return true 
} 
function isIP(s) //by zergling 
{ 
var patrn=/^[0-9.]{1,20}$/; 
if (!patrn.exec(s)) return false 
return true 
}

/*********************************************************************** 
* FUNCTION: isBetween 
* PARAMETERS: val AS any value 
* lo AS Lower limit to check 
* hi AS Higher limit to check 
* CALLS: NOTHING 
* RETURNS: TRUE if val is between lo and hi both inclusive, otherwise false. 
************************************************************************/ 
function isBetween (val, lo, hi) { 
if ((val < lo) || (val > hi)) { return(false); } 
else { return(true); } 
} 
/*********************************************************************** 
* FUNCTION: isDate checks a valid date 
* PARAMETERS: theStr AS String 
* CALLS: isBetween, isInt 
* RETURNS: TRUE if theStr is a valid date otherwise false. 
************************************************************************/ 
function isDate (theStr) { 
var the1st = theStr.indexOf(‘-‘); 
var the2nd = theStr.lastIndexOf(‘-‘); 
if (the1st == the2nd) { return(false); } 
else { 
var y = theStr.substring(0,the1st); 
var m = theStr.substring(the1st+1,the2nd); 
var d = theStr.substring(the2nd+1,theStr.length); 
var maxDays = 31; 
if (isInt(m)==false || isInt(d)==false || isInt(y)==false) { 
return(false); } 
else if (y.length < 4) { return(false); } 
else if (!isBetween (m, 1, 12)) { return(false); } 
else if (m==4 || m==6 || m==9 || m==11) maxDays = 30; 
else if (m==2) { 
if (y % 4 > 0) maxDays = 28; 
else if (y % 100 == 0 && y % 400 > 0) maxDays = 28; 
else maxDays = 29; 
} 
if (isBetween(d, 1, maxDays) == false) { return(false); } 
else { return(true); } 
} 
} 
/*********************************************************************** 
* FUNCTION: isEuDate checks a valid date in British format 
* PARAMETERS: theStr AS String 
* CALLS: isBetween, isInt 
* RETURNS: TRUE if theStr is a valid date otherwise false. 
************************************************************************/ 
function isEuDate (theStr) { 
if (isBetween(theStr.length, 8, 10) == false) { return(false); } 
else { 
var the1st = theStr.indexOf(‘/’); 
var the2nd = theStr.lastIndexOf(‘/’); 
if (the1st == the2nd) { return(false); } 
else { 
var m = theStr.substring(the1st+1,the2nd); 
var d = theStr.substring(0,the1st); 
var y = theStr.substring(the2nd+1,theStr.length); 
var maxDays = 31; 
if (isInt(m)==false || isInt(d)==false || isInt(y)==false) { 
return(false); } 
else if (y.length < 4) { return(false); } 
else if (isBetween (m, 1, 12) == false) { return(false); } 
else if (m==4 || m==6 || m==9 || m==11) maxDays = 30; 
else if (m==2) { 
if (y % 4 > 0) maxDays = 28; 
else if (y % 100 == 0 && y % 400 > 0) maxDays = 28; 
else maxDays = 29; 
} 
if (isBetween(d, 1, maxDays) == false) { return(false); } 
else { return(true); } 
} 
} 
} 
/********************************************************************** 
* FUNCTION: Compare Date! Which is the latest! 
* PARAMETERS: lessDate,moreDate AS String 
* CALLS: isDate,isBetween 
* RETURNS: TRUE if lessDate
参考网址：http://www.jb51.net/article/72044.htm 
一、正則表達式應用 
“^\d+$”　　//非负整数（正整数 + 0）  
“^[0-9][1-9][0-9]
”　　//非正整数（负整数 + 0）  
“^-[0-9][1-9][0-9]
”　　　　//整数  
“^\d+(.\d+)?$”　　//非负浮点数（正浮点数 + 0）  
“^(([0-9]+.[0-9][1-9][0-9])|([0-9][1-9][0-9].[0-9]+)|([0-9][1-9][0-9]))
”　　//非正浮点数（负浮点数 + 0）  
“^(-(([0-9]+.[0-9][1-9][0-9])|([0-9][1-9][0-9].[0-9]+)|([0-9][1-9][0-9])))
”　　//浮点数  
“^[A-Za-z]+
”　　//由26个英文字母的大写组成的字符串  
“^[a-z]+
”　　//由数字和26个英文字母组成的字符串  
“^\w+
”　　　　//email地址  
“^[a-zA-z]+://(\w+(-\w+))(.(\w+(-\w+)))(\?\S)?$”　　//url 
/^(d{2}|d{4})-((0([1-9]{1}))|(1[1|2]))-((0-2)|(3[0|1]))$/   //  年-月-日 
/^((0([1-9]{1}))|(1[1|2]))/((0-2)|(3[0|1]))/(d{2}|d{4})
”   //Emil 
“(d+-)?(d{4}-?d{7}|d{3}-?d{8}|^d{7,8})(-d+)?”     //电话号码 
“^(d{1,2}|1dd|2[0-4]d|25[0-5]).(d{1,2}|1dd|2[0-4]d|25[0-5]).(d{1,2}|1dd|2[0-4]d|25[0-5]).(d{1,2}|1dd|2[0-4]d|25[0-5])
//MAC地址的正则表达式 
^[-+]?\d+(.\d+)?$  //值类型正则表达式

“^\d+$”　　//非负整数（正整数 + 0）  
“^[0-9][1-9][0-9]
”　　//非正整数（负整数 + 0）  
“^-[0-9][1-9][0-9]
”　　　　//整数  
“^\d+(\.\d+)?$”　　//非负浮点数（正浮点数 + 0）  
“^(([0-9]+\.[0-9][1-9][0-9])|([0-9][1-9][0-9]\.[0-9]+)|([0-9][1-9][0-9]))
”　　//非正浮点数（负浮点数 + 0）  
“^(-(([0-9]+\.[0-9][1-9][0-9])|([0-9][1-9][0-9]\.[0-9]+)|([0-9][1-9][0-9])))
”　　//浮点数  
“^[A-Za-z]+
”　　//由26个英文字母的大写组成的字符串  
“^[a-z]+
”　　//由数字和26个英文字母组成的字符串  
“^\w+
”　　　　//email地址  
“^[a-zA-z]+://(\w+(-\w+))(\.(\w+(-\w+)))(\?\S)?$”　　//url

二、javascript正则表达式检验 
//校验是否全由数字组成  
function isDigit(s) 
{ 
var patrn=/^[0-9]{1,20}$/; 
if (!patrn.exec(s)) return false 
return true 
}
//校验登录名：只能输入5-20个以字母开头、可带数字、“_”、“.”的字串  
function isRegisterUserName(s) 
{ 
var patrn=/^[a-zA-Z]{1}([a-zA-Z0-9]|[._]){4,19}$/; 
if (!patrn.exec(s)) return false 
return true 
}
//校验用户姓名：只能输入1-30个以字母开头的字串  
function isTrueName(s) 
{ 
var patrn=/^[a-zA-Z]{1,30}$/; 
if (!patrn.exec(s)) return false 
return true 
}
//校验密码：只能输入6-20个字母、数字、下划线  
function isPasswd(s) 
{ 
var patrn=/^(\w){6,20}$/; 
if (!patrn.exec(s)) return false 
return true 
}
//校验普通电话、传真号码：可以“+”开头，除数字外，可含有“-”  
function isTel(s) 
{ 
//var patrn=/^[+]{0,1}(\d){1,3}[ ]?([-]?(\d){1,12})+
/; 
if (!patrn.exec(s)) return false 
return true 
}

//校验手机号码：必须以数字开头，除数字外，可含有“-” 
function isMobil(s) 
{ 
var patrn=/^[+]{0,1}(\d){1,3}[ ]?([-]?((\d)|[ ]){1,12})+$/; 
if (!patrn.exec(s)) return false 
return true 
}
//校验邮政编码 
function isPostalCode(s) 
{ 
//var patrn=/^[a-zA-Z0-9]{3,12}
/; 
if (!patrn.exec(s)) return false 
return true 
}

//校验搜索关键字 
function isSearch(s) 
{ 
var patrn=/^[^~!@#$%^&*()+=|\\\][\]\{\}:;\&#39;\,.<>/?]{1}[^~!@
/; 
if (!patrn.exec(s)) return false 
return true 
} 
function isIP(s) //by zergling 
{ 
var patrn=/^[0-9.]{1,20}$/; 
if (!patrn.exec(s)) return false 
return true 
}

/*********************************************************************** 
* FUNCTION: isBetween 
* PARAMETERS: val AS any value 
* lo AS Lower limit to check 
* hi AS Higher limit to check 
* CALLS: NOTHING 
* RETURNS: TRUE if val is between lo and hi both inclusive, otherwise false. 
************************************************************************/ 
function isBetween (val, lo, hi) { 
if ((val < lo) || (val > hi)) { return(false); } 
else { return(true); } 
} 
/*********************************************************************** 
* FUNCTION: isDate checks a valid date 
* PARAMETERS: theStr AS String 
* CALLS: isBetween, isInt 
* RETURNS: TRUE if theStr is a valid date otherwise false. 
************************************************************************/ 
function isDate (theStr) { 
var the1st = theStr.indexOf(‘-‘); 
var the2nd = theStr.lastIndexOf(‘-‘); 
if (the1st == the2nd) { return(false); } 
else { 
var y = theStr.substring(0,the1st); 
var m = theStr.substring(the1st+1,the2nd); 
var d = theStr.substring(the2nd+1,theStr.length); 
var maxDays = 31; 
if (isInt(m)==false || isInt(d)==false || isInt(y)==false) { 
return(false); } 
else if (y.length < 4) { return(false); } 
else if (!isBetween (m, 1, 12)) { return(false); } 
else if (m==4 || m==6 || m==9 || m==11) maxDays = 30; 
else if (m==2) { 
if (y % 4 > 0) maxDays = 28; 
else if (y % 100 == 0 && y % 400 > 0) maxDays = 28; 
else maxDays = 29; 
} 
if (isBetween(d, 1, maxDays) == false) { return(false); } 
else { return(true); } 
} 
} 
/*********************************************************************** 
* FUNCTION: isEuDate checks a valid date in British format 
* PARAMETERS: theStr AS String 
* CALLS: isBetween, isInt 
* RETURNS: TRUE if theStr is a valid date otherwise false. 
************************************************************************/ 
function isEuDate (theStr) { 
if (isBetween(theStr.length, 8, 10) == false) { return(false); } 
else { 
var the1st = theStr.indexOf(‘/’); 
var the2nd = theStr.lastIndexOf(‘/’); 
if (the1st == the2nd) { return(false); } 
else { 
var m = theStr.substring(the1st+1,the2nd); 
var d = theStr.substring(0,the1st); 
var y = theStr.substring(the2nd+1,theStr.length); 
var maxDays = 31; 
if (isInt(m)==false || isInt(d)==false || isInt(y)==false) { 
return(false); } 
else if (y.length < 4) { return(false); } 
else if (isBetween (m, 1, 12) == false) { return(false); } 
else if (m==4 || m==6 || m==9 || m==11) maxDays = 30; 
else if (m==2) { 
if (y % 4 > 0) maxDays = 28; 
else if (y % 100 == 0 && y % 400 > 0) maxDays = 28; 
else maxDays = 29; 
} 
if (isBetween(d, 1, maxDays) == false) { return(false); } 
else { return(true); } 
} 
} 
} 
/********************************************************************** 
* FUNCTION: Compare Date! Which is the latest! 
* PARAMETERS: lessDate,moreDate AS String 
* CALLS: isDate,isBetween 
* RETURNS: TRUE if lessDate
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